666408905878080 has 112 divisors (see below), whose sum is σ = 2115854005503744. Its totient is φ = 177708560363520.

The previous prime is 666408905878033. The next prime is 666408905878127. The reversal of 666408905878080 is 80878509804666.

It is an interprime number because it is at equal distance from previous prime (666408905878033) and next prime (666408905878127).

It is a junction number, because it is equal to n+sod(n) for n = 666408905877993 and 666408905878011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 484057900 + ... + 485432660.

Almost surely, 2^{666408905878080} is an apocalyptic number.

666408905878080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666408905878080 is an abundant number, since it is smaller than the sum of its proper divisors (1449445099625664).

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

666408905878080 is a wasteful number, since it uses less digits than its factorization.

666408905878080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879724 (or 1879714 counting only the distinct ones).

The product of its (nonzero) digits is 1114767360, while the sum is 75.

The spelling of 666408905878080 in words is "six hundred sixty-six trillion, four hundred eight billion, nine hundred five million, eight hundred seventy-eight thousand, eighty".