165561235232664 has 32 divisors (see below), whose sum is σ = 413927605062720. Its totient is φ = 55183809480096.

The previous prime is 165561235232651. The next prime is 165561235232671. The reversal of 165561235232664 is 466232532165561.

It is a super-2 number, since 2×165561235232664² (a number of 29 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 7 ways as a sum of consecutive naturals, for example, 203894542 + ... + 204704925.

It is an arithmetic number, because the mean of its divisors is an integer number (12935237658210).

Almost surely, 2^{165561235232664} is an apocalyptic number.

It is an amenable number.

165561235232664 is an abundant number, since it is smaller than the sum of its proper divisors (248366369830056).

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

165561235232664 is a wasteful number, since it uses less digits than its factorization.

165561235232664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408616359 (or 408616355 counting only the distinct ones).

The product of its digits is 46656000, while the sum is 57.

The spelling of 165561235232664 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, two hundred thirty-five million, two hundred thirty-two thousand, six hundred sixty-four".