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666666666666666 = 2323137412712906161
BaseRepresentation
bin1001011110010101000110110…
…1110110011010101010101010
310020102110201012020202212020100
42113211101231312122222222
51144340131313131313131
610321514234430210230
7260265035324131551
oct22745215566325252
93212421166685210
10666666666666666
11183469822407426
1262930571953976
13227cb521039453
14ba8aba5a78d98
1552117e36ec7e6
hex25e546dd9aaaa

666666666666666 has 192 divisors, whose sum is σ = 1574476548083712. Its totient is φ = 203384701440000.

The previous prime is 666666666666647. The next prime is 666666666666719.

666666666666666 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

666666666666666 is a modest number, since divided by 66666666 gives 6666666 as remainder.

It is a Curzon number.

666666666666666 is a nontrivial repdigit in base 10.

It is a plaindrome in base 10.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 227944626 + ... + 230850786.

It is an arithmetic number, because the mean of its divisors is an integer number (8200398687936).

Almost surely, 2666666666666666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666666666666666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787238274041856).

666666666666666 is an abundant number, since it is smaller than the sum of its proper divisors (907809881417046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666666666666666 is a wasteful number, since it uses less digits than its factorization.

666666666666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906549 (or 2906546 counting only the distinct ones).

The product of its digits is 470184984576, while the sum is 90.

The spelling of 666666666666666 in words is "six hundred sixty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-six".