666505887180 has 96 divisors (see below), whose sum is σ = 2245072488960. Its totient is φ = 144326085120.

The previous prime is 666505887167. The next prime is 666505887193. The reversal of 666505887180 is 81788505666.

It is an interprime number because it is at equal distance from previous prime (666505887167) and next prime (666505887193).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41753041 + ... + 41769000.

It is an arithmetic number, because the mean of its divisors is an integer number (23386171760).

Almost surely, 2^666505887180 is an apocalyptic number.

666505887180 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666505887180 is an abundant number, since it is smaller than the sum of its proper divisors (1578566601780).

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

666505887180 is a wasteful number, since it uses less digits than its factorization.

666505887180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83522079 (or 83522077 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 60.

The spelling of 666505887180 in words is "six hundred sixty-six billion, five hundred five million, eight hundred eighty-seven thousand, one hundred eighty".