666654756 has 12 divisors (see below), whose sum is σ = 1555527792. Its totient is φ = 222218248.

The previous prime is 666654733. The next prime is 666654809. The reversal of 666654756 is 657456666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 666654699 and 666654708.

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, 27777270 + ... + 27777293.

It is an arithmetic number, because the mean of its divisors is an integer number (129627316).

Almost surely, 2^666654756 is an apocalyptic number.

It is an amenable number.

666654756 is an abundant number, since it is smaller than the sum of its proper divisors (888873036).

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

666654756 is a wasteful number, since it uses less digits than its factorization.

666654756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55554570 (or 55554568 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 51.

The square root of 666654756 is about 25819.6583246177. The cubic root of 666654756 is about 873.5752622425.

The spelling of 666654756 in words is "six hundred sixty-six million, six hundred fifty-four thousand, seven hundred fifty-six".