15915944220 has 96 divisors (see below), whose sum is σ = 48640144896. Its totient is φ = 3856492800.

The previous prime is 15915944207. The next prime is 15915944249. The reversal of 15915944220 is 2244951951.

It is a congruent number.

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, 1682905 + ... + 1692335.

It is an arithmetic number, because the mean of its divisors is an integer number (506668176).

Almost surely, 2^15915944220 is an apocalyptic number.

15915944220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15915944220 is an abundant number, since it is smaller than the sum of its proper divisors (32724200676).

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

15915944220 is a wasteful number, since it uses less digits than its factorization.

15915944220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011 (or 12009 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 15915944220 in words is "fifteen billion, nine hundred fifteen million, nine hundred forty-four thousand, two hundred twenty".