18115247972 has 12 divisors (see below), whose sum is σ = 31703161980. Its totient is φ = 9057201696.

The previous prime is 18115247963. The next prime is 18115247993. The reversal of 18115247972 is 27974251181.

It can be written as a sum of positive squares in 2 ways, for example, as 10682049316 + 7433198656 = 103354^2 + 86216^2 .

It is a super-2 number, since 2×18115247972² (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, 3458 + ... + 190374.

It is an arithmetic number, because the mean of its divisors is an integer number (2641930165).

Almost surely, 2^18115247972 is an apocalyptic number.

It is an amenable number.

18115247972 is a deficient number, since it is larger than the sum of its proper divisors (13587914008).

18115247972 is a wasteful number, since it uses less digits than its factorization.

18115247972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211150 (or 211148 counting only the distinct ones).

The product of its digits is 282240, while the sum is 47.

The spelling of 18115247972 in words is "eighteen billion, one hundred fifteen million, two hundred forty-seven thousand, nine hundred seventy-two".