18156912630 has 32 divisors (see below), whose sum is σ = 44503755264. Its totient is φ = 4738825056.

The previous prime is 18156912551. The next prime is 18156912649. The reversal of 18156912630 is 3621965181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6437212 + ... + 6440031.

It is an arithmetic number, because the mean of its divisors is an integer number (1390742352).

Almost surely, 2^18156912630 is an apocalyptic number.

18156912630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18156912630 is an abundant number, since it is smaller than the sum of its proper divisors (26346842634).

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

18156912630 is a wasteful number, since it uses less digits than its factorization.

18156912630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12877300.

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 18156912630 in words is "eighteen billion, one hundred fifty-six million, nine hundred twelve thousand, six hundred thirty".