165205645635 has 32 divisors (see below), whose sum is σ = 284055109632. Its totient is φ = 81689034240.

The previous prime is 165205645597. The next prime is 165205645643. The reversal of 165205645635 is 536546502561.

It is not a de Polignac number, because 165205645635 - 2⁹ = 165205645123 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4817731 + ... + 4851900.

It is an arithmetic number, because the mean of its divisors is an integer number (8876722176).

Almost surely, 2^165205645635 is an apocalyptic number.

165205645635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

165205645635 is a deficient number, since it is larger than the sum of its proper divisors (118849463997).

165205645635 is a wasteful number, since it uses less digits than its factorization.

165205645635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9669723.

The product of its (nonzero) digits is 3240000, while the sum is 48.

The spelling of 165205645635 in words is "one hundred sixty-five billion, two hundred five million, six hundred forty-five thousand, six hundred thirty-five".