668431346428 has 24 divisors (see below), whose sum is σ = 1190462071680. Its totient is φ = 328344318000.

The previous prime is 668431346383. The next prime is 668431346459. The reversal of 668431346428 is 824643134866.

It is a congruent number.

It is an unprimeable number.

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, 5564448 + ... + 5683303.

It is an arithmetic number, because the mean of its divisors is an integer number (49602586320).

Almost surely, 2^668431346428 is an apocalyptic number.

It is an amenable number.

668431346428 is a deficient number, since it is larger than the sum of its proper divisors (522030725252).

668431346428 is a wasteful number, since it uses less digits than its factorization.

668431346428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11248017 (or 11248015 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 55.

The spelling of 668431346428 in words is "six hundred sixty-eight billion, four hundred thirty-one million, three hundred forty-six thousand, four hundred twenty-eight".