18451417420800 has 3960 divisors, whose sum is σ = 87375027145560. Its totient is φ = 3812504371200.

The previous prime is 18451417420783. The next prime is 18451417420867. The reversal of 18451417420800 is 802471415481.

18451417420800 is a `hidden beast` number, since 1 + 8 + 4 + 5 + 141 + 7 + 420 + 80 + 0 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 8974673842176 + 9476743578624 = 2995776^2 + 3078432^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 80573875086 + ... + 80573875314.

Almost surely, 2^{18451417420800} is an apocalyptic number.

18451417420800 is a gapful number since it is divisible by the number (10) 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 18451417420800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43687513572780).

18451417420800 is an abundant number, since it is smaller than the sum of its proper divisors (68923609724760).

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

18451417420800 is a wasteful number, since it uses less digits than its factorization.

18451417420800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 320 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 45.

The spelling of 18451417420800 in words is "eighteen trillion, four hundred fifty-one billion, four hundred seventeen million, four hundred twenty thousand, eight hundred".