666666707 has 24 divisors (see below), whose sum is σ = 819092736. Its totient is φ = 539922768.

The previous prime is 666666691. The next prime is 666666719. The reversal of 666666707 is 707666666.

It is not a de Polignac number, because 666666707 - 2⁴ = 666666691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666666727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89978 + ... + 97104.

It is an arithmetic number, because the mean of its divisors is an integer number (34128864).

Almost surely, 2^666666707 is an apocalyptic number.

666666707 is a deficient number, since it is larger than the sum of its proper divisors (152426029).

666666707 is a wasteful number, since it uses less digits than its factorization.

666666707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7247 (or 7240 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 50.

The square root of 666666707 is about 25819.8897557677. The cubic root of 666666707 is about 873.5804823535.

The spelling of 666666707 in words is "six hundred sixty-six million, six hundred sixty-six thousand, seven hundred seven".