18023817636 has 72 divisors (see below), whose sum is σ = 49717047744. Its totient is φ = 5460114240.

The previous prime is 18023817619. The next prime is 18023817649. The reversal of 18023817636 is 63671832081.

18023817636 is a `hidden beast` number, since 1 + 8 + 0 + 2 + 3 + 8 + 1 + 7 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18023817591 and 18023817600.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2202825 + ... + 2210991.

It is an arithmetic number, because the mean of its divisors is an integer number (690514552).

Almost surely, 2^18023817636 is an apocalyptic number.

It is an amenable number.

18023817636 is an abundant number, since it is smaller than the sum of its proper divisors (31693230108).

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

18023817636 is a wasteful number, since it uses less digits than its factorization.

18023817636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13761 (or 13756 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 18023817636 in words is "eighteen billion, twenty-three million, eight hundred seventeen thousand, six hundred thirty-six".