15855940320 has 192 divisors, whose sum is σ = 54572507136. Its totient is φ = 3837818880.

The previous prime is 15855940319. The next prime is 15855940339. The reversal of 15855940320 is 2304955851.

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, 3994977 + ... + 3998943.

It is an arithmetic number, because the mean of its divisors is an integer number (284231808).

Almost surely, 2^15855940320 is an apocalyptic number.

15855940320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15855940320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27286253568).

15855940320 is an abundant number, since it is smaller than the sum of its proper divisors (38716566816).

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

15855940320 is a wasteful number, since it uses less digits than its factorization.

15855940320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4753 (or 4745 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 15855940320 in words is "fifteen billion, eight hundred fifty-five million, nine hundred forty thousand, three hundred twenty".