668125093217 has 2 divisors, whose sum is σ = 668125093218. Its totient is φ = 668125093216.

The previous prime is 668125093189. The next prime is 668125093249. The reversal of 668125093217 is 712390521866.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 469936299361 + 198188793856 = 685519^2 + 445184^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668125093217 is a prime.

It is a super-2 number, since 2×668125093217² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (668125093817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334062546608 + 334062546609.

It is an arithmetic number, because the mean of its divisors is an integer number (334062546609).

Almost surely, 2^668125093217 is an apocalyptic number.

It is an amenable number.

668125093217 is a deficient number, since it is larger than the sum of its proper divisors (1).

668125093217 is an equidigital number, since it uses as much as digits as its factorization.

668125093217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 668125093217 in words is "six hundred sixty-eight billion, one hundred twenty-five million, ninety-three thousand, two hundred seventeen".