668683117837 has 8 divisors (see below), whose sum is σ = 764616003200. Its totient is φ = 572851913904.

The previous prime is 668683117793. The next prime is 668683117841. The reversal of 668683117837 is 738711386866.

668683117837 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668683117837 is a prime.

It is a super-2 number, since 2×668683117837² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668683117847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25406262 + ... + 25432567.

It is an arithmetic number, because the mean of its divisors is an integer number (95577000400).

Almost surely, 2^668683117837 is an apocalyptic number.

It is an amenable number.

668683117837 is a deficient number, since it is larger than the sum of its proper divisors (95932885363).

668683117837 is a wasteful number, since it uses less digits than its factorization.

668683117837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50840715.

The product of its digits is 48771072, while the sum is 64.

The spelling of 668683117837 in words is "six hundred sixty-eight billion, six hundred eighty-three million, one hundred seventeen thousand, eight hundred thirty-seven".