18538355372 has 12 divisors (see below), whose sum is σ = 32636387280. Its totient is φ = 9213673296.

The previous prime is 18538355359. The next prime is 18538355377. The reversal of 18538355372 is 27355383581.

It is a super-2 number, since 2×18538355372² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18538355372.

It is not an unprimeable number, because it can be changed into a prime (18538355377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13875347 + ... + 13876682.

It is an arithmetic number, because the mean of its divisors is an integer number (2719698940).

Almost surely, 2^18538355372 is an apocalyptic number.

It is an amenable number.

18538355372 is a deficient number, since it is larger than the sum of its proper divisors (14098031908).

18538355372 is a wasteful number, since it uses less digits than its factorization.

18538355372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27752200 (or 27752198 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 50.

The spelling of 18538355372 in words is "eighteen billion, five hundred thirty-eight million, three hundred fifty-five thousand, three hundred seventy-two".