668898187695 has 12 divisors (see below), whose sum is σ = 1159423525416. Its totient is φ = 356745700080.

The previous prime is 668898187691. The next prime is 668898187739. The reversal of 668898187695 is 596781898866.

It is not a de Polignac number, because 668898187695 - 2² = 668898187691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668898187691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7432202041 + ... + 7432202130.

It is an arithmetic number, because the mean of its divisors is an integer number (96618627118).

Almost surely, 2^668898187695 is an apocalyptic number.

668898187695 is a deficient number, since it is larger than the sum of its proper divisors (490525337721).

668898187695 is a wasteful number, since it uses less digits than its factorization.

668898187695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14864404182 (or 14864404179 counting only the distinct ones).

The product of its digits is 2508226560, while the sum is 81.

The spelling of 668898187695 in words is "six hundred sixty-eight billion, eight hundred ninety-eight million, one hundred eighty-seven thousand, six hundred ninety-five".