663166656 has 56 divisors (see below), whose sum is σ = 1949592240. Its totient is φ = 221054976.

The previous prime is 663166649. The next prime is 663166657. The reversal of 663166656 is 656661366.

It is not an unprimeable number, because it can be changed into a prime (663166657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190161 + ... + 193616.

Almost surely, 2^663166656 is an apocalyptic number.

It is an amenable number.

663166656 is an abundant number, since it is smaller than the sum of its proper divisors (1286425584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663166656 is a wasteful number, since it uses less digits than its factorization.

663166656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383798 (or 383782 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 663166656 is about 25752.0223671851. The cubic root of 663166656 is about 872.0490110769.

The spelling of 663166656 in words is "six hundred sixty-three million, one hundred sixty-six thousand, six hundred fifty-six".