165512055720 has 128 divisors (see below), whose sum is σ = 550857024000. Its totient is φ = 39444046080.

The previous prime is 165512055719. The next prime is 165512055733. The reversal of 165512055720 is 27550215561.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 984730 + ... + 1140489.

It is an arithmetic number, because the mean of its divisors is an integer number (4303570500).

Almost surely, 2^165512055720 is an apocalyptic number.

165512055720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165512055720 is an abundant number, since it is smaller than the sum of its proper divisors (385344968280).

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

165512055720 is a wasteful number, since it uses less digits than its factorization.

165512055720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125303 (or 2125299 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 39.

The spelling of 165512055720 in words is "one hundred sixty-five billion, five hundred twelve million, fifty-five thousand, seven hundred twenty".