18002912256 has 440 divisors, whose sum is σ = 62250678336. Its totient is φ = 5076172800.

The previous prime is 18002912237. The next prime is 18002912287. The reversal of 18002912256 is 65221920081.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18002912256.

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, 58641255 + ... + 58641561.

Almost surely, 2^18002912256 is an apocalyptic number.

18002912256 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 18002912256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31125339168).

18002912256 is an abundant number, since it is smaller than the sum of its proper divisors (44247766080).

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

18002912256 is a wasteful number, since it uses less digits than its factorization.

18002912256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 18002912256 in words is "eighteen billion, two million, nine hundred twelve thousand, two hundred fifty-six".