18279972864 has 360 divisors, whose sum is σ = 57266230560. Its totient is φ = 5759631360.

The previous prime is 18279972863. The next prime is 18279972917. The reversal of 18279972864 is 46827997281.

It is not an unprimeable number, because it can be changed into a prime (18279972863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 425115627 + ... + 425115669.

Almost surely, 2^18279972864 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 18279972864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28633115280).

18279972864 is an abundant number, since it is smaller than the sum of its proper divisors (38986257696).

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

18279972864 is an frugal number, since it uses more digits than its factorization.

18279972864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 79 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 18279972864 in words is "eighteen billion, two hundred seventy-nine million, nine hundred seventy-two thousand, eight hundred sixty-four".