18385613136 has 90 divisors (see below), whose sum is σ = 56557128810. Its totient is φ = 5571392640.

The previous prime is 18385613119. The next prime is 18385613153. The reversal of 18385613136 is 63131658381.

18385613136 is a `hidden beast` number, since 1 + 83 + 8 + 561 + 3 + 1 + 3 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (18385613119) and next prime (18385613153).

It can be written as a sum of positive squares in only one way, i.e., 17950640400 + 434972736 = 133980^2 + 20856^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18385613091 and 18385613100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 510171 + ... + 545018.

Almost surely, 2^18385613136 is an apocalyptic number.

18385613136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18385613136 is an abundant number, since it is smaller than the sum of its proper divisors (38171515674).

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

18385613136 is a wasteful number, since it uses less digits than its factorization.

18385613136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055225 (or 1055205 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 18385613136 in words is "eighteen billion, three hundred eighty-five million, six hundred thirteen thousand, one hundred thirty-six".