18388972548 has 18 divisors (see below), whose sum is σ = 46483236254. Its totient is φ = 6129657504.

The previous prime is 18388972507. The next prime is 18388972561. The reversal of 18388972548 is 84527988381.

18388972548 is a `hidden beast` number, since 1 + 8 + 3 + 8 + 89 + 7 + 2 + 548 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17994076164 + 394896384 = 134142^2 + 19872^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×18388972548² (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 5 ways as a sum of consecutive naturals, for example, 255402361 + ... + 255402432.

Almost surely, 2^18388972548 is an apocalyptic number.

18388972548 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18388972548 is an abundant number, since it is smaller than the sum of its proper divisors (28094263706).

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

18388972548 is a wasteful number, since it uses less digits than its factorization.

18388972548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510804803 (or 510804798 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 18388972548 in words is "eighteen billion, three hundred eighty-eight million, nine hundred seventy-two thousand, five hundred forty-eight".