18663400810560 has 224 divisors, whose sum is σ = 64748026553472. Its totient is φ = 4517126225920.

The previous prime is 18663400810559. The next prime is 18663400810627. The reversal of 18663400810560 is 6501800436681.

It is a super-2 number, since 2×18663400810560² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5083294 + ... + 7947746.

Almost surely, 2^{18663400810560} is an apocalyptic number.

18663400810560 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 18663400810560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32374013276736).

18663400810560 is an abundant number, since it is smaller than the sum of its proper divisors (46084625742912).

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

18663400810560 is a wasteful number, since it uses less digits than its factorization.

18663400810560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865101 (or 2865091 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 18663400810560 in words is "eighteen trillion, six hundred sixty-three billion, four hundred million, eight hundred ten thousand, five hundred sixty".