668898187694 has 16 divisors (see below), whose sum is σ = 1095174622080. Its totient is φ = 303874088760.

The previous prime is 668898187691. The next prime is 668898187739. The reversal of 668898187694 is 496781898866.

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8486984 + ... + 8565435.

It is an arithmetic number, because the mean of its divisors is an integer number (68448413880).

Almost surely, 2^668898187694 is an apocalyptic number.

668898187694 is a deficient number, since it is larger than the sum of its proper divisors (426276434386).

668898187694 is a wasteful number, since it uses less digits than its factorization.

668898187694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17054215.

The product of its digits is 2006581248, while the sum is 80.

The spelling of 668898187694 in words is "six hundred sixty-eight billion, eight hundred ninety-eight million, one hundred eighty-seven thousand, six hundred ninety-four".