668007664 has 10 divisors (see below), whose sum is σ = 1294264880. Its totient is φ = 334003824.

The previous prime is 668007661. The next prime is 668007671. The reversal of 668007664 is 466700866.

It is a self number, because there is not a number n which added to its sum of digits gives 668007664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668007661) 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 as a sum of consecutive naturals, namely, 20875224 + ... + 20875255.

It is an arithmetic number, because the mean of its divisors is an integer number (129426488).

Almost surely, 2^668007664 is an apocalyptic number.

It is an amenable number.

668007664 is a deficient number, since it is larger than the sum of its proper divisors (626257216).

668007664 is a wasteful number, since it uses less digits than its factorization.

668007664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41750487 (or 41750481 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 668007664 is about 25845.8442307463. The cubic root of 668007664 is about 874.1658069772.

The spelling of 668007664 in words is "six hundred sixty-eight million, seven thousand, six hundred sixty-four".