666935980 has 12 divisors (see below), whose sum is σ = 1400565600. Its totient is φ = 266774384.

The previous prime is 666935917. The next prime is 666935999. The reversal of 666935980 is 89539666.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16673380 + ... + 16673419.

It is an arithmetic number, because the mean of its divisors is an integer number (116713800).

Almost surely, 2^666935980 is an apocalyptic number.

It is an amenable number.

666935980 is an abundant number, since it is smaller than the sum of its proper divisors (733629620).

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

666935980 is a wasteful number, since it uses less digits than its factorization.

666935980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33346808 (or 33346806 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 52.

The square root of 666935980 is about 25825.1036783979. The cubic root of 666935980 is about 873.6980823332.

The spelling of 666935980 in words is "six hundred sixty-six million, nine hundred thirty-five thousand, nine hundred eighty".