668766343135117 has 4 divisors (see below), whose sum is σ = 668781365222880. Its totient is φ = 668751321047356.

The previous prime is 668766343135109. The next prime is 668766343135207. The reversal of 668766343135117 is 711531343667866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 668766343135117 - 2³ = 668766343135109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668766343135417) 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, 7510977103 + ... + 7511066140.

It is an arithmetic number, because the mean of its divisors is an integer number (167195341305720).

Almost surely, 2^{668766343135117} is an apocalyptic number.

It is an amenable number.

668766343135117 is a deficient number, since it is larger than the sum of its proper divisors (15022087763).

668766343135117 is a wasteful number, since it uses less digits than its factorization.

668766343135117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15022087762.

The product of its digits is 274337280, while the sum is 67.

The spelling of 668766343135117 in words is "six hundred sixty-eight trillion, seven hundred sixty-six billion, three hundred forty-three million, one hundred thirty-five thousand, one hundred seventeen".