666741406808 has 8 divisors (see below), whose sum is σ = 1250140137780. Its totient is φ = 333370703400.

The previous prime is 666741406757. The next prime is 666741406819. The reversal of 666741406808 is 808604147666.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41671337918 + ... + 41671337933.

Almost surely, 2^666741406808 is an apocalyptic number.

It is an amenable number.

666741406808 is a deficient number, since it is larger than the sum of its proper divisors (583398730972).

666741406808 is a wasteful number, since it uses less digits than its factorization.

666741406808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83342675857 (or 83342675853 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 56.

The spelling of 666741406808 in words is "six hundred sixty-six billion, seven hundred forty-one million, four hundred six thousand, eight hundred eight".