668525867 has 8 divisors (see below), whose sum is σ = 708076800. Its totient is φ = 629000064.

The previous prime is 668525863. The next prime is 668525909. The reversal of 668525867 is 768525866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668525867 - 2² = 668525863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668525861) 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 7 ways as a sum of consecutive naturals, for example, 100109 + ... + 106577.

It is an arithmetic number, because the mean of its divisors is an integer number (88509600).

Almost surely, 2^668525867 is an apocalyptic number.

668525867 is a deficient number, since it is larger than the sum of its proper divisors (39550933).

668525867 is a wasteful number, since it uses less digits than its factorization.

668525867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12565.

The product of its digits is 4838400, while the sum is 53.

The square root of 668525867 is about 25855.8671678209. The cubic root of 668525867 is about 874.3917915391.

Subtracting 668525867 from its reverse (768525866), we obtain a palindrome (99999999).

The spelling of 668525867 in words is "six hundred sixty-eight million, five hundred twenty-five thousand, eight hundred sixty-seven".