668259578 has 32 divisors (see below), whose sum is σ = 1172236800. Its totient is φ = 279811584.

The previous prime is 668259539. The next prime is 668259617. The reversal of 668259578 is 875952866.

It is an interprime number because it is at equal distance from previous prime (668259539) and next prime (668259617).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104168 + ... + 110396.

It is an arithmetic number, because the mean of its divisors is an integer number (36632400).

Almost surely, 2^668259578 is an apocalyptic number.

668259578 is a deficient number, since it is larger than the sum of its proper divisors (503977222).

668259578 is a wasteful number, since it uses less digits than its factorization.

668259578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6414.

The product of its digits is 7257600, while the sum is 56.

The square root of 668259578 is about 25850.7171660672. The cubic root of 668259578 is about 874.2756794337.

The spelling of 668259578 in words is "six hundred sixty-eight million, two hundred fifty-nine thousand, five hundred seventy-eight".