666153351666 has 96 divisors (see below), whose sum is σ = 1642757716800. Its totient is φ = 198442601280.

The previous prime is 666153351637. The next prime is 666153351697.

666153351666 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1906630 + ... + 2228798.

It is an arithmetic number, because the mean of its divisors is an integer number (17112059550).

Almost surely, 2^666153351666 is an apocalyptic number.

666153351666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 666153351666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821378858400).

666153351666 is an abundant number, since it is smaller than the sum of its proper divisors (976604365134).

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

666153351666 is a wasteful number, since it uses less digits than its factorization.

666153351666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322309 (or 322244 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 54.

The spelling of 666153351666 in words is "six hundred sixty-six billion, one hundred fifty-three million, three hundred fifty-one thousand, six hundred sixty-six".