18681364764 has 36 divisors (see below), whose sum is σ = 47226597600. Its totient is φ = 6226560000.

The previous prime is 18681364729. The next prime is 18681364771. The reversal of 18681364764 is 46746318681.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18681364764.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 635389 + ... + 664139.

Almost surely, 2^18681364764 is an apocalyptic number.

It is an amenable number.

18681364764 is an abundant number, since it is smaller than the sum of its proper divisors (28545232836).

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

18681364764 is a wasteful number, since it uses less digits than its factorization.

18681364764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46810 (or 46805 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 18681364764 in words is "eighteen billion, six hundred eighty-one million, three hundred sixty-four thousand, seven hundred sixty-four".