664086231569 has 2 divisors, whose sum is σ = 664086231570. Its totient is φ = 664086231568.

The previous prime is 664086231559. The next prime is 664086231577. The reversal of 664086231569 is 965132680466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 532235907025 + 131850324544 = 729545^2 + 363112^2 .

It is a cyclic number.

It is not a de Polignac number, because 664086231569 - 2⁸ = 664086231313 is a prime.

It is a super-2 number, since 2×664086231569² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (664086231509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332043115784 + 332043115785.

It is an arithmetic number, because the mean of its divisors is an integer number (332043115785).

Almost surely, 2^664086231569 is an apocalyptic number.

It is an amenable number.

664086231569 is a deficient number, since it is larger than the sum of its proper divisors (1).

664086231569 is an equidigital number, since it uses as much as digits as its factorization.

664086231569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 56.

The spelling of 664086231569 in words is "six hundred sixty-four billion, eighty-six million, two hundred thirty-one thousand, five hundred sixty-nine".