668936389942 has 16 divisors (see below), whose sum is σ = 1056231673200. Its totient is φ = 316859709600.

The previous prime is 668936389939. The next prime is 668936389949. The reversal of 668936389942 is 249983639866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668936389949) 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, 3949192 + ... + 4115092.

It is an arithmetic number, because the mean of its divisors is an integer number (66014479575).

Almost surely, 2^668936389942 is an apocalyptic number.

668936389942 is a deficient number, since it is larger than the sum of its proper divisors (387295283258).

668936389942 is a wasteful number, since it uses less digits than its factorization.

668936389942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272031.

The product of its digits is 725594112, while the sum is 73.

The spelling of 668936389942 in words is "six hundred sixty-eight billion, nine hundred thirty-six million, three hundred eighty-nine thousand, nine hundred forty-two".