165105635897 has 2 divisors, whose sum is σ = 165105635898. Its totient is φ = 165105635896.

The previous prime is 165105635887. The next prime is 165105636011. The reversal of 165105635897 is 798536501561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124678903801 + 40426732096 = 353099^2 + 201064^2 .

It is a cyclic number.

It is not a de Polignac number, because 165105635897 - 2³⁶ = 96386159161 is a prime.

It is not a weakly prime, because it can be changed into another prime (165105635887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82552817948 + 82552817949.

It is an arithmetic number, because the mean of its divisors is an integer number (82552817949).

Almost surely, 2^165105635897 is an apocalyptic number.

It is an amenable number.

165105635897 is a deficient number, since it is larger than the sum of its proper divisors (1).

165105635897 is an equidigital number, since it uses as much as digits as its factorization.

165105635897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804000, while the sum is 56.

The spelling of 165105635897 in words is "one hundred sixty-five billion, one hundred five million, six hundred thirty-five thousand, eight hundred ninety-seven".