18271222152 has 32 divisors (see below), whose sum is σ = 46426879680. Its totient is φ = 5990564160.

The previous prime is 18271222139. The next prime is 18271222163. The reversal of 18271222152 is 25122217281.

It is a super-2 number, since 2×18271222152² (a number of 21 digits) contains 22 as substring.

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, 6238708 + ... + 6241635.

It is an arithmetic number, because the mean of its divisors is an integer number (1450839990).

Almost surely, 2^18271222152 is an apocalyptic number.

18271222152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18271222152 is an abundant number, since it is smaller than the sum of its proper divisors (28155657528).

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

18271222152 is a wasteful number, since it uses less digits than its factorization.

18271222152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12480413 (or 12480409 counting only the distinct ones).

The product of its digits is 8960, while the sum is 33.

The spelling of 18271222152 in words is "eighteen billion, two hundred seventy-one million, two hundred twenty-two thousand, one hundred fifty-two".