664666760 has 16 divisors (see below), whose sum is σ = 1495500300. Its totient is φ = 265866688.

The previous prime is 664666757. The next prime is 664666777. The reversal of 664666760 is 67666466.

It can be written as a sum of positive squares in 2 ways, for example, as 645464836 + 19201924 = 25406^2 + 4382^2 .

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, 8308295 + ... + 8308374.

Almost surely, 2^664666760 is an apocalyptic number.

It is an amenable number.

664666760 is an abundant number, since it is smaller than the sum of its proper divisors (830833540).

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

664666760 is a wasteful number, since it uses less digits than its factorization.

664666760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16616680 (or 16616676 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 47.

The square root of 664666760 is about 25781.1318603354. The cubic root of 664666760 is about 872.7060500810.

The spelling of 664666760 in words is "six hundred sixty-four million, six hundred sixty-six thousand, seven hundred sixty".