161515015256 has 64 divisors (see below), whose sum is σ = 359033472000. Its totient is φ = 66677495040.

The previous prime is 161515015247. The next prime is 161515015309. The reversal of 161515015256 is 652510515161.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 263846 + ... + 626613.

It is an arithmetic number, because the mean of its divisors is an integer number (5609898000).

Almost surely, 2^161515015256 is an apocalyptic number.

It is an amenable number.

161515015256 is an abundant number, since it is smaller than the sum of its proper divisors (197518456744).

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

161515015256 is a wasteful number, since it uses less digits than its factorization.

161515015256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890592 (or 890588 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 38.

The spelling of 161515015256 in words is "one hundred sixty-one billion, five hundred fifteen million, fifteen thousand, two hundred fifty-six".