668394627895 has 4 divisors (see below), whose sum is σ = 802073553480. Its totient is φ = 534715702312.

The previous prime is 668394627883. The next prime is 668394627991. The reversal of 668394627895 is 598726493866.

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 668394627895 - 2⁷ = 668394627767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66839462785 + ... + 66839462794.

It is an arithmetic number, because the mean of its divisors is an integer number (200518388370).

Almost surely, 2^668394627895 is an apocalyptic number.

668394627895 is a deficient number, since it is larger than the sum of its proper divisors (133678925585).

668394627895 is a wasteful number, since it uses less digits than its factorization.

668394627895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133678925584.

The product of its digits is 940584960, while the sum is 73.

The spelling of 668394627895 in words is "six hundred sixty-eight billion, three hundred ninety-four million, six hundred twenty-seven thousand, eight hundred ninety-five".