15909921912 has 64 divisors (see below), whose sum is σ = 41367173760. Its totient is φ = 5095036800.

The previous prime is 15909921877. The next prime is 15909921917. The reversal of 15909921912 is 21912990951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15909921917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63414 + ... + 189317.

It is an arithmetic number, because the mean of its divisors is an integer number (646362090).

Almost surely, 2^15909921912 is an apocalyptic number.

15909921912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15909921912 is an abundant number, since it is smaller than the sum of its proper divisors (25457251848).

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

15909921912 is a wasteful number, since it uses less digits than its factorization.

15909921912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252844 (or 252840 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 48.

The spelling of 15909921912 in words is "fifteen billion, nine hundred nine million, nine hundred twenty-one thousand, nine hundred twelve".