165661044023256 has 16 divisors (see below), whose sum is σ = 414152610058200. Its totient is φ = 55220348007744.

The previous prime is 165661044023249. The next prime is 165661044023269. The reversal of 165661044023256 is 652320440166561.

It is a junction number, because it is equal to n+sod(n) for n = 165661044023199 and 165661044023208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3451271750461 + ... + 3451271750508.

Almost surely, 2^{165661044023256} is an apocalyptic number.

It is an amenable number.

165661044023256 is an abundant number, since it is smaller than the sum of its proper divisors (248491566034944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165661044023256 is a wasteful number, since it uses less digits than its factorization.

165661044023256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6902543500978 (or 6902543500974 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 165661044023256 in words is "one hundred sixty-five trillion, six hundred sixty-one billion, forty-four million, twenty-three thousand, two hundred fifty-six".