668134740601 has 4 divisors (see below), whose sum is σ = 668170911604. Its totient is φ = 668098569600.

The previous prime is 668134740587. The next prime is 668134740677. The reversal of 668134740601 is 106047431866.

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

It can be written as a sum of positive squares in 2 ways, for example, as 393505290000 + 274629450601 = 627300^2 + 524051^2 .

It is a cyclic number.

It is not a de Polignac number, because 668134740601 - 2⁷ = 668134740473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668134740901) 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, 18057780 + ... + 18094741.

It is an arithmetic number, because the mean of its divisors is an integer number (167042727901).

Almost surely, 2^668134740601 is an apocalyptic number.

It is an amenable number.

668134740601 is a deficient number, since it is larger than the sum of its proper divisors (36171003).

668134740601 is a wasteful number, since it uses less digits than its factorization.

668134740601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36171002.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 668134740601 in words is "six hundred sixty-eight billion, one hundred thirty-four million, seven hundred forty thousand, six hundred one".