668945392129 has 16 divisors (see below), whose sum is σ = 773335728000. Its totient is φ = 566765679744.

The previous prime is 668945392117. The next prime is 668945392147. The reversal of 668945392129 is 921293549866.

It is a cyclic number.

It is not a de Polignac number, because 668945392129 - 2⁹ = 668945391617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668945392229) 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, 1892539 + ... + 2218015.

It is an arithmetic number, because the mean of its divisors is an integer number (48333483000).

Almost surely, 2^668945392129 is an apocalyptic number.

It is an amenable number.

668945392129 is a deficient number, since it is larger than the sum of its proper divisors (104390335871).

668945392129 is a wasteful number, since it uses less digits than its factorization.

668945392129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328872.

The product of its digits is 50388480, while the sum is 64.

The spelling of 668945392129 in words is "six hundred sixty-eight billion, nine hundred forty-five million, three hundred ninety-two thousand, one hundred twenty-nine".