18538957416 has 32 divisors (see below), whose sum is σ = 52968450240. Its totient is φ = 5296844928.

The previous prime is 18538957387. The next prime is 18538957447. The reversal of 18538957416 is 61475983581.

It is a super-2 number, since 2×18538957416² (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, 55175301 + ... + 55175636.

It is an arithmetic number, because the mean of its divisors is an integer number (1655264070).

Almost surely, 2^18538957416 is an apocalyptic number.

It is an amenable number.

18538957416 is an abundant number, since it is smaller than the sum of its proper divisors (34429492824).

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

18538957416 is a wasteful number, since it uses less digits than its factorization.

18538957416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110350953 (or 110350949 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 57.

The spelling of 18538957416 in words is "eighteen billion, five hundred thirty-eight million, nine hundred fifty-seven thousand, four hundred sixteen".