665294086637 has 2 divisors, whose sum is σ = 665294086638. Its totient is φ = 665294086636.

The previous prime is 665294086609. The next prime is 665294086643. The reversal of 665294086637 is 736680492566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658465708681 + 6828377956 = 811459^2 + 82634^2 .

It is a cyclic number.

It is not a de Polignac number, because 665294086637 - 2⁸ = 665294086381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665294086637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665294086697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332647043318 + 332647043319.

It is an arithmetic number, because the mean of its divisors is an integer number (332647043319).

Almost surely, 2^665294086637 is an apocalyptic number.

It is an amenable number.

665294086637 is a deficient number, since it is larger than the sum of its proper divisors (1).

665294086637 is an equidigital number, since it uses as much as digits as its factorization.

665294086637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78382080, while the sum is 62.

The spelling of 665294086637 in words is "six hundred sixty-five billion, two hundred ninety-four million, eighty-six thousand, six hundred thirty-seven".