668146634123 has 4 divisors (see below), whose sum is σ = 668395666488. Its totient is φ = 667897601760.

The previous prime is 668146634053. The next prime is 668146634159. The reversal of 668146634123 is 321436641866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668146634123 - 2⁸ = 668146633867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668146639123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124512158 + ... + 124517523.

It is an arithmetic number, because the mean of its divisors is an integer number (167098916622).

Almost surely, 2^668146634123 is an apocalyptic number.

668146634123 is a deficient number, since it is larger than the sum of its proper divisors (249032365).

668146634123 is a wasteful number, since it uses less digits than its factorization.

668146634123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249032364.

The product of its digits is 2985984, while the sum is 50.

The spelling of 668146634123 in words is "six hundred sixty-eight billion, one hundred forty-six million, six hundred thirty-four thousand, one hundred twenty-three".