165679553522 has 18 divisors (see below), whose sum is σ = 289100945997. Its totient is φ = 71003796024.

The previous prime is 165679553521. The next prime is 165679553531. The reversal of 165679553522 is 225355976561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 159463650241 + 6215903281 = 399329^2 + 78841^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=287819.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165679553521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4008908 + ... + 4050024.

Almost surely, 2^165679553522 is an apocalyptic number.

165679553522 is a deficient number, since it is larger than the sum of its proper divisors (123421392475).

165679553522 is an frugal number, since it uses more digits than its factorization.

165679553522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82250 (or 41126 counting only the distinct ones).

The product of its digits is 17010000, while the sum is 56.

The spelling of 165679553522 in words is "one hundred sixty-five billion, six hundred seventy-nine million, five hundred fifty-three thousand, five hundred twenty-two".