161531626025253 has 64 divisors (see below), whose sum is σ = 247632979451904. Its totient is φ = 92701266240000.

The previous prime is 161531626025243. The next prime is 161531626025279. The reversal of 161531626025253 is 352520626135161.

It is not a de Polignac number, because 161531626025253 - 2⁸ = 161531626024997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161531626025243) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 555402393 + ... + 555693153.

It is an arithmetic number, because the mean of its divisors is an integer number (3869265303936).

Almost surely, 2^{161531626025253} is an apocalyptic number.

It is an amenable number.

161531626025253 is a deficient number, since it is larger than the sum of its proper divisors (86101353426651).

161531626025253 is a wasteful number, since it uses less digits than its factorization.

161531626025253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298146.

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 161531626025253 in words is "one hundred sixty-one trillion, five hundred thirty-one billion, six hundred twenty-six million, twenty-five thousand, two hundred fifty-three".