668595867 has 4 divisors (see below), whose sum is σ = 891461160. Its totient is φ = 445730576.

The previous prime is 668595803. The next prime is 668595869. The reversal of 668595867 is 768595866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668595867 - 2⁶ = 668595803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 668595867.

It is not an unprimeable number, because it can be changed into a prime (668595869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111432642 + ... + 111432647.

It is an arithmetic number, because the mean of its divisors is an integer number (222865290).

Almost surely, 2^668595867 is an apocalyptic number.

668595867 is a deficient number, since it is larger than the sum of its proper divisors (222865293).

668595867 is a wasteful number, since it uses less digits than its factorization.

668595867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222865292.

The product of its digits is 21772800, while the sum is 60.

The square root of 668595867 is about 25857.2207903324. The cubic root of 668595867 is about 874.4223090764.

Subtracting 668595867 from its reverse (768595866), we obtain a palindrome (99999999).

The spelling of 668595867 in words is "six hundred sixty-eight million, five hundred ninety-five thousand, eight hundred sixty-seven".