667564125769 has 2 divisors, whose sum is σ = 667564125770. Its totient is φ = 667564125768.

The previous prime is 667564125749. The next prime is 667564125797. The reversal of 667564125769 is 967521465766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525642400144 + 141921725625 = 725012^2 + 376725^2 .

It is a cyclic number.

It is not a de Polignac number, because 667564125769 - 2²⁹ = 667027254857 is a prime.

It is a super-2 number, since 2×667564125769² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667564125769.

It is not a weakly prime, because it can be changed into another prime (667564125749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333782062884 + 333782062885.

It is an arithmetic number, because the mean of its divisors is an integer number (333782062885).

Almost surely, 2^667564125769 is an apocalyptic number.

It is an amenable number.

667564125769 is a deficient number, since it is larger than the sum of its proper divisors (1).

667564125769 is an equidigital number, since it uses as much as digits as its factorization.

667564125769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 114307200, while the sum is 64.

The spelling of 667564125769 in words is "six hundred sixty-seven billion, five hundred sixty-four million, one hundred twenty-five thousand, seven hundred sixty-nine".