165561444520564 has 12 divisors (see below), whose sum is σ = 289746015912388. Its totient is φ = 82776868545600.

The previous prime is 165561444520529. The next prime is 165561444520597. The reversal of 165561444520564 is 465025444165561.

165561444520564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 130899730264164 + 34661714256400 = 11441142^2 + 5887420^2 .

It is a junction number, because it is equal to n+sod(n) for n = 165561444520499 and 165561444520508.

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, 963332007 + ... + 963503854.

Almost surely, 2^{165561444520564} is an apocalyptic number.

It is an amenable number.

165561444520564 is a deficient number, since it is larger than the sum of its proper divisors (124184571391824).

165561444520564 is a wasteful number, since it uses less digits than its factorization.

165561444520564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926857346 (or 1926857344 counting only the distinct ones).

The product of its (nonzero) digits is 69120000, while the sum is 58.

The spelling of 165561444520564 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, four hundred forty-four million, five hundred twenty thousand, five hundred sixty-four".