666465668 has 12 divisors (see below), whose sum is σ = 1272343632. Its totient is φ = 302938920.

The previous prime is 666465649. The next prime is 666465677. The reversal of 666465668 is 866564666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7573430 + ... + 7573517.

It is an arithmetic number, because the mean of its divisors is an integer number (106028636).

Almost surely, 2^666465668 is an apocalyptic number.

It is an amenable number.

666465668 is a deficient number, since it is larger than the sum of its proper divisors (605877964).

666465668 is a wasteful number, since it uses less digits than its factorization.

666465668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15146962 (or 15146960 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 53.

The square root of 666465668 is about 25815.9963588470. The cubic root of 666465668 is about 873.4926616572.

The spelling of 666465668 in words is "six hundred sixty-six million, four hundred sixty-five thousand, six hundred sixty-eight".