666704568 has 16 divisors (see below), whose sum is σ = 1666761480. Its totient is φ = 222234848.

The previous prime is 666704561. The next prime is 666704587. The reversal of 666704568 is 865407666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666704561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13889655 + ... + 13889702.

Almost surely, 2^666704568 is an apocalyptic number.

It is an amenable number.

666704568 is an abundant number, since it is smaller than the sum of its proper divisors (1000056912).

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

666704568 is a wasteful number, since it uses less digits than its factorization.

666704568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27779366 (or 27779362 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The square root of 666704568 is about 25820.6229204487. The cubic root of 666704568 is about 873.5970193548.

The spelling of 666704568 in words is "six hundred sixty-six million, seven hundred four thousand, five hundred sixty-eight".