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666101999 is a prime number
BaseRepresentation
bin100111101100111…
…110100011101111
31201102101111011102
4213230332203233
52331010230444
6150032513315
722335526223
oct4754764357
91642344142
10666101999
11311aa7322
121670ab83b
13a80010c4
1464672783
153d72884e
hex27b3e8ef

666101999 has 2 divisors, whose sum is σ = 666102000. Its totient is φ = 666101998.

The previous prime is 666101987. The next prime is 666102061. The reversal of 666101999 is 999101666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666101999 - 24 = 666101983 is a prime.

It is a Chen prime.

666101999 is a strobogrammatic number because it is the same when read upside-down.

It is equal to p34586669 and since 666101999 and 34586669 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666101959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333050999 + 333051000.

It is an arithmetic number, because the mean of its divisors is an integer number (333051000).

Almost surely, 2666101999 is an apocalyptic number.

666101999 is a deficient number, since it is larger than the sum of its proper divisors (1).

666101999 is an equidigital number, since it uses as much as digits as its factorization.

666101999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 666101999 is about 25808.9519159535. The cubic root of 666101999 is about 873.3337537470. Note that the first 3 decimals are identical.

The spelling of 666101999 in words is "six hundred sixty-six million, one hundred one thousand, nine hundred ninety-nine".