164989507920 has 80 divisors (see below), whose sum is σ = 511577881920. Its totient is φ = 43987704832.

The previous prime is 164989507919. The next prime is 164989507931. The reversal of 164989507920 is 29705989461.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1077076 + ... + 1220684.

It is an arithmetic number, because the mean of its divisors is an integer number (6394723524).

Almost surely, 2^164989507920 is an apocalyptic number.

164989507920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164989507920 is an abundant number, since it is smaller than the sum of its proper divisors (346588374000).

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

164989507920 is a wasteful number, since it uses less digits than its factorization.

164989507920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148412 (or 148406 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 60.

The spelling of 164989507920 in words is "one hundred sixty-four billion, nine hundred eighty-nine million, five hundred seven thousand, nine hundred twenty".