667745433445117 has 2 divisors, whose sum is σ = 667745433445118. Its totient is φ = 667745433445116.

The previous prime is 667745433445073. The next prime is 667745433445141. The reversal of 667745433445117 is 711544334547766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586667546730841 + 81077886714276 = 24221221^2 + 9004326^2 .

It is a cyclic number.

It is not a de Polignac number, because 667745433445117 - 2²³ = 667745425056509 is a prime.

It is a super-2 number, since 2×667745433445117² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667745433445157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333872716722558 + 333872716722559.

It is an arithmetic number, because the mean of its divisors is an integer number (333872716722559).

Almost surely, 2^{667745433445117} is an apocalyptic number.

It is an amenable number.

667745433445117 is a deficient number, since it is larger than the sum of its proper divisors (1).

667745433445117 is an equidigital number, since it uses as much as digits as its factorization.

667745433445117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 711244800, while the sum is 67.

The spelling of 667745433445117 in words is "six hundred sixty-seven trillion, seven hundred forty-five billion, four hundred thirty-three million, four hundred forty-five thousand, one hundred seventeen".