18115220272 has 20 divisors (see below), whose sum is σ = 36308524320. Its totient is φ = 8745278528.

The previous prime is 18115220267. The next prime is 18115220287. The reversal of 18115220272 is 27202251181.

It is a super-2 number, since 2×18115220272² (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 3 ways as a sum of consecutive naturals, for example, 19520248 + ... + 19521175.

It is an arithmetic number, because the mean of its divisors is an integer number (1815426216).

Almost surely, 2^18115220272 is an apocalyptic number.

It is an amenable number.

18115220272 is an abundant number, since it is smaller than the sum of its proper divisors (18193304048).

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

18115220272 is a wasteful number, since it uses less digits than its factorization.

18115220272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39041460 (or 39041454 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The spelling of 18115220272 in words is "eighteen billion, one hundred fifteen million, two hundred twenty thousand, two hundred seventy-two".