15981293180 has 12 divisors (see below), whose sum is σ = 33560715720. Its totient is φ = 6392517264.

The previous prime is 15981293177. The next prime is 15981293213. The reversal of 15981293180 is 8139218951.

It is a happy number.

It is a super-2 number, since 2×15981293180² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399532310 + ... + 399532349.

It is an arithmetic number, because the mean of its divisors is an integer number (2796726310).

Almost surely, 2^15981293180 is an apocalyptic number.

15981293180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15981293180 is an abundant number, since it is smaller than the sum of its proper divisors (17579422540).

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

15981293180 is a wasteful number, since it uses less digits than its factorization.

15981293180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799064668 (or 799064666 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 47.

The spelling of 15981293180 in words is "fifteen billion, nine hundred eighty-one million, two hundred ninety-three thousand, one hundred eighty".