664086231577 has 2 divisors, whose sum is σ = 664086231578. Its totient is φ = 664086231576.

The previous prime is 664086231569. The next prime is 664086231659. The reversal of 664086231577 is 775132680466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 624335442201 + 39750789376 = 790149^2 + 199376^2 .

It is a cyclic number.

It is not a de Polignac number, because 664086231577 - 2³ = 664086231569 is a prime.

It is not a weakly prime, because it can be changed into another prime (664086231517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332043115788 + 332043115789.

It is an arithmetic number, because the mean of its divisors is an integer number (332043115789).

Almost surely, 2^664086231577 is an apocalyptic number.

It is an amenable number.

664086231577 is a deficient number, since it is larger than the sum of its proper divisors (1).

664086231577 is an equidigital number, since it uses as much as digits as its factorization.

664086231577 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 664086231577 in words is "six hundred sixty-four billion, eighty-six million, two hundred thirty-one thousand, five hundred seventy-seven".