666325115656 has 8 divisors (see below), whose sum is σ = 1249359591870. Its totient is φ = 333162557824.

The previous prime is 666325115591. The next prime is 666325115719. The reversal of 666325115656 is 656511523666.

It can be written as a sum of positive squares in only one way, i.e., 523264156900 + 143060958756 = 723370^2 + 378234^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41645319721 + ... + 41645319736.

Almost surely, 2^666325115656 is an apocalyptic number.

It is an amenable number.

666325115656 is a deficient number, since it is larger than the sum of its proper divisors (583034476214).

666325115656 is a wasteful number, since it uses less digits than its factorization.

666325115656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83290639463 (or 83290639459 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 52.

The spelling of 666325115656 in words is "six hundred sixty-six billion, three hundred twenty-five million, one hundred fifteen thousand, six hundred fifty-six".