18406579653 has 36 divisors (see below), whose sum is σ = 33398913184. Its totient is φ = 9561855600.

The previous prime is 18406579619. The next prime is 18406579687. The reversal of 18406579653 is 35697560481.

18406579653 is a `hidden beast` number, since 1 + 8 + 4 + 0 + 6 + 579 + 65 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (18406579619) and next prime (18406579687).

It is not a de Polignac number, because 18406579653 - 2⁸ = 18406579397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18406579653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18406579603) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1199683 + ... + 1214928.

Almost surely, 2^18406579653 is an apocalyptic number.

It is an amenable number.

18406579653 is a deficient number, since it is larger than the sum of its proper divisors (14992333531).

18406579653 is a wasteful number, since it uses less digits than its factorization.

18406579653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414646 (or 2414632 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 18406579653 in words is "eighteen billion, four hundred six million, five hundred seventy-nine thousand, six hundred fifty-three".