668898187703 has 4 divisors (see below), whose sum is σ = 668912438568. Its totient is φ = 668883936840.

The previous prime is 668898187691. The next prime is 668898187739. The reversal of 668898187703 is 307781898866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668898187703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668898187753) 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, 7054793 + ... + 7148978.

It is an arithmetic number, because the mean of its divisors is an integer number (167228109642).

Almost surely, 2^668898187703 is an apocalyptic number.

668898187703 is a deficient number, since it is larger than the sum of its proper divisors (14250865).

668898187703 is a wasteful number, since it uses less digits than its factorization.

668898187703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14250864.

The product of its (nonzero) digits is 195084288, while the sum is 71.

The spelling of 668898187703 in words is "six hundred sixty-eight billion, eight hundred ninety-eight million, one hundred eighty-seven thousand, seven hundred three".