165811610256 has 40 divisors (see below), whose sum is σ = 438794144544. Its totient is φ = 53922474240.

The previous prime is 165811610231. The next prime is 165811610269. The reversal of 165811610256 is 652016118561.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42124966 + ... + 42128901.

Almost surely, 2^165811610256 is an apocalyptic number.

165811610256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165811610256 is an abundant number, since it is smaller than the sum of its proper divisors (272982534288).

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

165811610256 is a wasteful number, since it uses less digits than its factorization.

165811610256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84253919 (or 84253913 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The spelling of 165811610256 in words is "one hundred sixty-five billion, eight hundred eleven million, six hundred ten thousand, two hundred fifty-six".