667645504365677 has 2 divisors, whose sum is σ = 667645504365678. Its totient is φ = 667645504365676.

The previous prime is 667645504365613. The next prime is 667645504365703. The reversal of 667645504365677 is 776563405546766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 663599187055561 + 4046317310116 = 25760419^2 + 2011546^2 .

It is a cyclic number.

It is not a de Polignac number, because 667645504365677 - 2⁶ = 667645504365613 is a prime.

It is a super-2 number, since 2×667645504365677² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667645504365598 and 667645504365607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667645504365277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333822752182838 + 333822752182839.

It is an arithmetic number, because the mean of its divisors is an integer number (333822752182839).

Almost surely, 2^{667645504365677} is an apocalyptic number.

It is an amenable number.

667645504365677 is a deficient number, since it is larger than the sum of its proper divisors (1).

667645504365677 is an equidigital number, since it uses as much as digits as its factorization.

667645504365677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16003008000, while the sum is 77.

The spelling of 667645504365677 in words is "six hundred sixty-seven trillion, six hundred forty-five billion, five hundred four million, three hundred sixty-five thousand, six hundred seventy-seven".