668685190043 has 16 divisors (see below), whose sum is σ = 738306092160. Its totient is φ = 601764151296.

The previous prime is 668685190021. The next prime is 668685190067. The reversal of 668685190043 is 340091586866.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 668685190043 - 2⁸ = 668685189787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668685190003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1972178 + ... + 2286231.

It is an arithmetic number, because the mean of its divisors is an integer number (46144130760).

Almost surely, 2^668685190043 is an apocalyptic number.

668685190043 is a deficient number, since it is larger than the sum of its proper divisors (69620902117).

668685190043 is a wasteful number, since it uses less digits than its factorization.

668685190043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4258726.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 668685190043 in words is "six hundred sixty-eight billion, six hundred eighty-five million, one hundred ninety thousand, forty-three".