18535968400 has 60 divisors (see below), whose sum is σ = 44574458932. Its totient is φ = 7407429120.

The previous prime is 18535968359. The next prime is 18535968413. The reversal of 18535968400 is 486953581.

It can be written as a sum of positive squares in 6 ways, for example, as 1058070784 + 17477897616 = 32528^2 + 132204^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 416002 + ... + 458398.

Almost surely, 2^18535968400 is an apocalyptic number.

18535968400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18535968400 is an abundant number, since it is smaller than the sum of its proper divisors (26038490532).

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

18535968400 is a wasteful number, since it uses less digits than its factorization.

18535968400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43508 (or 43497 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 18535968400 in words is "eighteen billion, five hundred thirty-five million, nine hundred sixty-eight thousand, four hundred".