161239521264 has 80 divisors (see below), whose sum is σ = 443893588992. Its totient is φ = 50315862784.

The previous prime is 161239521259. The next prime is 161239521299. The reversal of 161239521264 is 462125932161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1501839 + ... + 1605614.

Almost surely, 2^161239521264 is an apocalyptic number.

It is an amenable number.

161239521264 is an abundant number, since it is smaller than the sum of its proper divisors (282654067728).

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

161239521264 is a wasteful number, since it uses less digits than its factorization.

161239521264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107534 (or 3107528 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The spelling of 161239521264 in words is "one hundred sixty-one billion, two hundred thirty-nine million, five hundred twenty-one thousand, two hundred sixty-four".