18520040564 has 12 divisors (see below), whose sum is σ = 32416772388. Its totient is φ = 9258105600.

The previous prime is 18520040551. The next prime is 18520040633. The reversal of 18520040564 is 46504002581.

It can be written as a sum of positive squares in 2 ways, for example, as 9844608400 + 8675432164 = 99220^2 + 93142^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456797 + ... + 495684.

It is an arithmetic number, because the mean of its divisors is an integer number (2701397699).

Almost surely, 2^18520040564 is an apocalyptic number.

It is an amenable number.

18520040564 is a deficient number, since it is larger than the sum of its proper divisors (13896731824).

18520040564 is a wasteful number, since it uses less digits than its factorization.

18520040564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957346 (or 957344 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 18520040564 in words is "eighteen billion, five hundred twenty million, forty thousand, five hundred sixty-four".