666680946 has 24 divisors (see below), whose sum is σ = 1338629712. Its totient is φ = 221352000.

The previous prime is 666680879. The next prime is 666680953. The reversal of 666680946 is 649086666.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 964461 + ... + 965151.

It is an arithmetic number, because the mean of its divisors is an integer number (55776238).

Almost surely, 2^666680946 is an apocalyptic number.

666680946 is an abundant number, since it is smaller than the sum of its proper divisors (671948766).

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

666680946 is an equidigital number, since it uses as much as digits as its factorization.

666680946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 51.

The square root of 666680946 is about 25820.1654913364. The cubic root of 666680946 is about 873.5867017651.

The spelling of 666680946 in words is "six hundred sixty-six million, six hundred eighty thousand, nine hundred forty-six".