18564699136 has 88 divisors (see below), whose sum is σ = 38856317760. Its totient is φ = 8848637952.

The previous prime is 18564699079. The next prime is 18564699229. The reversal of 18564699136 is 63199646581.

It is a happy number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 7935855 + ... + 7938193.

Almost surely, 2^18564699136 is an apocalyptic number.

18564699136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18564699136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19428158880).

18564699136 is an abundant number, since it is smaller than the sum of its proper divisors (20291618624).

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

18564699136 is a wasteful number, since it uses less digits than its factorization.

18564699136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719 (or 2701 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 58.

The spelling of 18564699136 in words is "eighteen billion, five hundred sixty-four million, six hundred ninety-nine thousand, one hundred thirty-six".