18156312780 has 24 divisors (see below), whose sum is σ = 50837675952. Its totient is φ = 4841683392.

The previous prime is 18156312761. The next prime is 18156312803. The reversal of 18156312780 is 8721365181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151302547 + ... + 151302666.

It is an arithmetic number, because the mean of its divisors is an integer number (2118236498).

Almost surely, 2^18156312780 is an apocalyptic number.

18156312780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18156312780 is an abundant number, since it is smaller than the sum of its proper divisors (32681363172).

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

18156312780 is a wasteful number, since it uses less digits than its factorization.

18156312780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302605225 (or 302605223 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The spelling of 18156312780 in words is "eighteen billion, one hundred fifty-six million, three hundred twelve thousand, seven hundred eighty".