18988406613 has 40 divisors (see below), whose sum is σ = 31071766176. Its totient is φ = 11507994000.

The previous prime is 18988406579. The next prime is 18988406653. The reversal of 18988406613 is 31660488981.

18988406613 is a `hidden beast` number, since 18 + 9 + 8 + 8 + 4 + 0 + 6 + 613 = 666.

It is not a de Polignac number, because 18988406613 - 2²⁰ = 18987358037 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18988406613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18988406653) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 172663 + ... + 260363.

Almost surely, 2^18988406613 is an apocalyptic number.

It is an amenable number.

18988406613 is a deficient number, since it is larger than the sum of its proper divisors (12083359563).

18988406613 is an frugal number, since it uses more digits than its factorization.

18988406613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87739 (or 87715 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 18988406613 in words is "eighteen billion, nine hundred eighty-eight million, four hundred six thousand, six hundred thirteen".