666417177980 has 24 divisors (see below), whose sum is σ = 1399713400512. Its totient is φ = 266521666112.

The previous prime is 666417177941. The next prime is 666417177983. The reversal of 666417177980 is 89771714666.

It is a super-2 number, since 2×666417177980² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666417177983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2704307 + ... + 2940426.

It is an arithmetic number, because the mean of its divisors is an integer number (58321391688).

Almost surely, 2^666417177980 is an apocalyptic number.

It is an amenable number.

666417177980 is an abundant number, since it is smaller than the sum of its proper divisors (733296222532).

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

666417177980 is a wasteful number, since it uses less digits than its factorization.

666417177980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5650645 (or 5650643 counting only the distinct ones).

The product of its (nonzero) digits is 21337344, while the sum is 62.

The spelling of 666417177980 in words is "six hundred sixty-six billion, four hundred seventeen million, one hundred seventy-seven thousand, nine hundred eighty".