185916345997 has 2 divisors, whose sum is σ = 185916345998. Its totient is φ = 185916345996.

The previous prime is 185916345961. The next prime is 185916346061. The reversal of 185916345997 is 799543619581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146387351236 + 39528994761 = 382606^2 + 198819^2 .

It is a cyclic number.

It is not a de Polignac number, because 185916345997 - 2¹⁵ = 185916313229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185916345917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92958172998 + 92958172999.

It is an arithmetic number, because the mean of its divisors is an integer number (92958172999).

Almost surely, 2^185916345997 is an apocalyptic number.

It is an amenable number.

185916345997 is a deficient number, since it is larger than the sum of its proper divisors (1).

185916345997 is an equidigital number, since it uses as much as digits as its factorization.

185916345997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73483200, while the sum is 67.

The spelling of 185916345997 in words is "one hundred eighty-five billion, nine hundred sixteen million, three hundred forty-five thousand, nine hundred ninety-seven".