18215023155 has 32 divisors (see below), whose sum is σ = 33630864384. Its totient is φ = 8246019456.

The previous prime is 18215023129. The next prime is 18215023231. The reversal of 18215023155 is 55132051281.

It is not a de Polignac number, because 18215023155 - 2⁹ = 18215022643 is a prime.

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, 831304 + ... + 852933.

It is an arithmetic number, because the mean of its divisors is an integer number (1050964512).

Almost surely, 2^18215023155 is an apocalyptic number.

18215023155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18215023155 is a deficient number, since it is larger than the sum of its proper divisors (15415841229).

18215023155 is a wasteful number, since it uses less digits than its factorization.

18215023155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1684355.

The product of its (nonzero) digits is 12000, while the sum is 33.

The spelling of 18215023155 in words is "eighteen billion, two hundred fifteen million, twenty-three thousand, one hundred fifty-five".