18021099264 has 360 divisors, whose sum is σ = 58053974160. Its totient is φ = 4956585984.

The previous prime is 18021099259. The next prime is 18021099281. The reversal of 18021099264 is 46299012081.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 53474904 + ... + 53475240.

Almost surely, 2^18021099264 is an apocalyptic number.

18021099264 is a gapful number since it is divisible by the number (14) 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 18021099264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29026987080).

18021099264 is an abundant number, since it is smaller than the sum of its proper divisors (40032874896).

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

18021099264 is an frugal number, since it uses more digits than its factorization.

18021099264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 42.

The spelling of 18021099264 in words is "eighteen billion, twenty-one million, ninety-nine thousand, two hundred sixty-four".