165138086888 has 32 divisors (see below), whose sum is σ = 313010316360. Its totient is φ = 81669672960.

The previous prime is 165138086831. The next prime is 165138086923. The reversal of 165138086888 is 888680831561.

It can be written as a sum of positive squares in 4 ways, for example, as 159806458564 + 5331628324 = 399758^2 + 73018^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165138086888.

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, 1273670 + ... + 1397322.

Almost surely, 2^165138086888 is an apocalyptic number.

It is an amenable number.

165138086888 is a deficient number, since it is larger than the sum of its proper divisors (147872229472).

165138086888 is a wasteful number, since it uses less digits than its factorization.

165138086888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125477 (or 125473 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 62.

The spelling of 165138086888 in words is "one hundred sixty-five billion, one hundred thirty-eight million, eighty-six thousand, eight hundred eighty-eight".