18663978813480 has 384 divisors, whose sum is σ = 81442818213120. Its totient is φ = 3579903959040.

The previous prime is 18663978813479. The next prime is 18663978813527. The reversal of 18663978813480 is 8431887936681.

18663978813480 is a `hidden beast` number, since 1 + 8 + 6 + 63 + 9 + 7 + 8 + 81 + 3 + 480 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 18663978813399 and 18663978813408.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 25535937 + ... + 26256656.

It is an arithmetic number, because the mean of its divisors is an integer number (212090672430).

Almost surely, 2^{18663978813480} is an apocalyptic number.

18663978813480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18663978813480 is an abundant number, since it is smaller than the sum of its proper divisors (62778839399640).

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

18663978813480 is a wasteful number, since it uses less digits than its factorization.

18663978813480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51792641 (or 51792634 counting only the distinct ones).

The product of its (nonzero) digits is 334430208, while the sum is 72.

The spelling of 18663978813480 in words is "eighteen trillion, six hundred sixty-three billion, nine hundred seventy-eight million, eight hundred thirteen thousand, four hundred eighty".