165290925820 has 24 divisors (see below), whose sum is σ = 350547690528. Its totient is φ = 65461752000.

The previous prime is 165290925773. The next prime is 165290925869. The reversal of 165290925820 is 28529092561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40911576 + ... + 40915615.

It is an arithmetic number, because the mean of its divisors is an integer number (14606153772).

Almost surely, 2^165290925820 is an apocalyptic number.

165290925820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165290925820 is an abundant number, since it is smaller than the sum of its proper divisors (185256764708).

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

165290925820 is a wasteful number, since it uses less digits than its factorization.

165290925820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81827301 (or 81827299 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 165290925820 in words is "one hundred sixty-five billion, two hundred ninety million, nine hundred twenty-five thousand, eight hundred twenty".