667645504365613 has 2 divisors, whose sum is σ = 667645504365614. Its totient is φ = 667645504365612.

The previous prime is 667645504365547. The next prime is 667645504365677. The reversal of 667645504365613 is 316563405546766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 518004035128804 + 149641469236809 = 22759702^2 + 12232803^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667645504365613 is a prime.

It is a super-2 number, since 2×667645504365613² (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 (667645504465613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333822752182806 + 333822752182807.

It is an arithmetic number, because the mean of its divisors is an integer number (333822752182807).

Almost surely, 2^{667645504365613} is an apocalyptic number.

It is an amenable number.

667645504365613 is a deficient number, since it is larger than the sum of its proper divisors (1).

667645504365613 is an equidigital number, since it uses as much as digits as its factorization.

667645504365613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776000, while the sum is 67.

The spelling of 667645504365613 in words is "six hundred sixty-seven trillion, six hundred forty-five billion, five hundred four million, three hundred sixty-five thousand, six hundred thirteen".