18255367872 has 210 divisors, whose sum is σ = 62950546692. Its totient is φ = 5215746816.

The previous prime is 18255367831. The next prime is 18255367891. The reversal of 18255367872 is 27876355281.

18255367872 is a `hidden beast` number, since 1 + 8 + 2 + 553 + 6 + 7 + 87 + 2 = 666.

It is a super-2 number, since 2×18255367872² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 218083 + ... + 289949.

Almost surely, 2^18255367872 is an apocalyptic number.

18255367872 is a gapful number since it is divisible by the number (12) 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 18255367872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31475273346).

18255367872 is an abundant number, since it is smaller than the sum of its proper divisors (44695178820).

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

18255367872 is an equidigital number, since it uses as much as digits as its factorization.

18255367872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71905 (or 71879 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 18255367872 in words is "eighteen billion, two hundred fifty-five million, three hundred sixty-seven thousand, eight hundred seventy-two".