161565504992 has 24 divisors (see below), whose sum is σ = 324849794976. Its totient is φ = 79063969792.

The previous prime is 161565504943. The next prime is 161565505007. The reversal of 161565504992 is 299405565161.

It is a happy number.

It is a super-2 number, since 2×161565504992² (a number of 23 digits) contains 22 as substring.

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, 53710433 + ... + 53713440.

It is an arithmetic number, because the mean of its divisors is an integer number (13535408124).

Almost surely, 2^161565504992 is an apocalyptic number.

It is an amenable number.

161565504992 is an abundant number, since it is smaller than the sum of its proper divisors (163284289984).

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

161565504992 is a wasteful number, since it uses less digits than its factorization.

161565504992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107423930 (or 107423922 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 161565504992 in words is "one hundred sixty-one billion, five hundred sixty-five million, five hundred four thousand, nine hundred ninety-two".