18155512872 has 96 divisors (see below), whose sum is σ = 58133462400. Its totient is φ = 5008413312.

The previous prime is 18155512841. The next prime is 18155512889. The reversal of 18155512872 is 27821555181.

It is a happy number.

18155512872 is a `hidden beast` number, since 1 + 8 + 1 + 5 + 551 + 28 + 72 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 606468 + ... + 635699.

It is an arithmetic number, because the mean of its divisors is an integer number (605556900).

Almost surely, 2^18155512872 is an apocalyptic number.

18155512872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18155512872 is an abundant number, since it is smaller than the sum of its proper divisors (39977949528).

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

18155512872 is a wasteful number, since it uses less digits than its factorization.

18155512872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242215 (or 1242208 counting only the distinct ones).

The product of its digits is 224000, while the sum is 45.

The spelling of 18155512872 in words is "eighteen billion, one hundred fifty-five million, five hundred twelve thousand, eight hundred seventy-two".