18925732864 has 44 divisors (see below), whose sum is σ = 37855785100. Its totient is φ = 9457164288.

The previous prime is 18925732853. The next prime is 18925732871. The reversal of 18925732864 is 46823752981.

It can be written as a sum of positive squares in 2 ways, for example, as 11837440000 + 7088292864 = 108800^2 + 84192^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2073142 + ... + 2082250.

Almost surely, 2^18925732864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18925732864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18927892550).

18925732864 is an abundant number, since it is smaller than the sum of its proper divisors (18930052236).

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

18925732864 is an equidigital number, since it uses as much as digits as its factorization.

18925732864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11158 (or 11140 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 18925732864 in words is "eighteen billion, nine hundred twenty-five million, seven hundred thirty-two thousand, eight hundred sixty-four".