18564036564 has 36 divisors (see below), whose sum is σ = 45715879104. Its totient is φ = 5862325968.

The previous prime is 18564036563. The next prime is 18564036599. The reversal of 18564036564 is 46563046581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18564036563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2138332 + ... + 2146995.

Almost surely, 2^18564036564 is an apocalyptic number.

It is an amenable number.

18564036564 is an abundant number, since it is smaller than the sum of its proper divisors (27151842540).

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

18564036564 is a wasteful number, since it uses less digits than its factorization.

18564036564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4285372 (or 4285351 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 18564036564 in words is "eighteen billion, five hundred sixty-four million, thirty-six thousand, five hundred sixty-four".