165639398600 has 96 divisors (see below), whose sum is σ = 429036993000. Its totient is φ = 59050199040.

The previous prime is 165639398599. The next prime is 165639398621. The reversal of 165639398600 is 6893936561.

It can be written as a sum of positive squares in 12 ways, for example, as 3057868804 + 162581529796 = 55298^2 + 403214^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1023005 + ... + 1173804.

Almost surely, 2^165639398600 is an apocalyptic number.

165639398600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165639398600 is an abundant number, since it is smaller than the sum of its proper divisors (263397594400).

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

165639398600 is a wasteful number, since it uses less digits than its factorization.

165639398600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196867 (or 2196858 counting only the distinct ones).

The product of its (nonzero) digits is 6298560, while the sum is 56.

The spelling of 165639398600 in words is "one hundred sixty-five billion, six hundred thirty-nine million, three hundred ninety-eight thousand, six hundred".