668985375687 has 8 divisors (see below), whose sum is σ = 908810321904. Its totient is φ = 437575339968.

The previous prime is 668985375677. The next prime is 668985375697. The reversal of 668985375687 is 786573589866.

It is an interprime number because it is at equal distance from previous prime (668985375677) and next prime (668985375697).

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

It is not a de Polignac number, because 668985375687 - 2⁴ = 668985375671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668985375607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2103727438 + ... + 2103727755.

It is an arithmetic number, because the mean of its divisors is an integer number (113601290238).

Almost surely, 2^668985375687 is an apocalyptic number.

668985375687 is a deficient number, since it is larger than the sum of its proper divisors (239824946217).

668985375687 is a wasteful number, since it uses less digits than its factorization.

668985375687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207455249.

The product of its digits is 3657830400, while the sum is 78.

The spelling of 668985375687 in words is "six hundred sixty-eight billion, nine hundred eighty-five million, three hundred seventy-five thousand, six hundred eighty-seven".