666001610056 has 16 divisors (see below), whose sum is σ = 1248867151740. Its totient is φ = 332970369600.

The previous prime is 666001610017. The next prime is 666001610093. The reversal of 666001610056 is 650016100666.

It can be written as a sum of positive squares in 2 ways, for example, as 624046281156 + 41955328900 = 789966^2 + 204830^2 .

It is a junction number, because it is equal to n+sod(n) for n = 666001609997 and 666001610024.

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, 3711295 + ... + 3886606.

Almost surely, 2^666001610056 is an apocalyptic number.

It is an amenable number.

666001610056 is a deficient number, since it is larger than the sum of its proper divisors (582865541684).

666001610056 is a wasteful number, since it uses less digits than its factorization.

666001610056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7608864 (or 7608860 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 666001610056 in words is "six hundred sixty-six billion, one million, six hundred ten thousand, fifty-six".