664680068 has 24 divisors (see below), whose sum is σ = 1281802368. Its totient is φ = 299640096.

The previous prime is 664680053. The next prime is 664680073. The reversal of 664680068 is 860086466.

664680068 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146396 + ... + 150867.

It is an arithmetic number, because the mean of its divisors is an integer number (53408432).

Almost surely, 2^664680068 is an apocalyptic number.

It is an amenable number.

664680068 is a deficient number, since it is larger than the sum of its proper divisors (617122300).

664680068 is a wasteful number, since it uses less digits than its factorization.

664680068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297323 (or 297321 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 664680068 is about 25781.3899547716. The cubic root of 664680068 is about 872.7118745008.

The spelling of 664680068 in words is "six hundred sixty-four million, six hundred eighty thousand, sixty-eight".