18534647644 has 12 divisors (see below), whose sum is σ = 32919747784. Its totient is φ = 9129005424.

The previous prime is 18534647617. The next prime is 18534647693. The reversal of 18534647644 is 44674643581.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18534647591 and 18534647600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34579299 + ... + 34579834.

Almost surely, 2^18534647644 is an apocalyptic number.

It is an amenable number.

18534647644 is a deficient number, since it is larger than the sum of its proper divisors (14385100140).

18534647644 is a wasteful number, since it uses less digits than its factorization.

18534647644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69159204 (or 69159202 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 52.

The spelling of 18534647644 in words is "eighteen billion, five hundred thirty-four million, six hundred forty-seven thousand, six hundred forty-four".