666718796 has 12 divisors (see below), whose sum is σ = 1170487752. Its totient is φ = 332293728.

The previous prime is 666718783. The next prime is 666718823. The reversal of 666718796 is 697817666.

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, 265010 + ... + 267513.

It is an arithmetic number, because the mean of its divisors is an integer number (97540646).

Almost surely, 2^666718796 is an apocalyptic number.

It is an amenable number.

666718796 is a deficient number, since it is larger than the sum of its proper divisors (503768956).

666718796 is a wasteful number, since it uses less digits than its factorization.

666718796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532840 (or 532838 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 56.

The square root of 666718796 is about 25820.8984351823. The cubic root of 666718796 is about 873.6032337265.

The spelling of 666718796 in words is "six hundred sixty-six million, seven hundred eighteen thousand, seven hundred ninety-six".