165730878643 has 12 divisors (see below), whose sum is σ = 182467190080. Its totient is φ = 150416156880.

The previous prime is 165730878613. The next prime is 165730878659. The reversal of 165730878643 is 346878037561.

It is not a de Polignac number, because 165730878643 - 2²⁵ = 165697324211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165730878613) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1054788 + ... + 1201681.

Almost surely, 2^165730878643 is an apocalyptic number.

165730878643 is a deficient number, since it is larger than the sum of its proper divisors (16736311437).

165730878643 is a wasteful number, since it uses less digits than its factorization.

165730878643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257098 (or 2257087 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 58.

The spelling of 165730878643 in words is "one hundred sixty-five billion, seven hundred thirty million, eight hundred seventy-eight thousand, six hundred forty-three".