665432747569 has 2 divisors, whose sum is σ = 665432747570. Its totient is φ = 665432747568.

The previous prime is 665432747537. The next prime is 665432747579. The reversal of 665432747569 is 965747234566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 661652096400 + 3780651169 = 813420^2 + 61487^2 .

It is a cyclic number.

It is not a de Polignac number, because 665432747569 - 2⁵ = 665432747537 is a prime.

It is a super-2 number, since 2×665432747569² (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 665432747569.

It is not a weakly prime, because it can be changed into another prime (665432747579) 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, 332716373784 + 332716373785.

It is an arithmetic number, because the mean of its divisors is an integer number (332716373785).

Almost surely, 2^665432747569 is an apocalyptic number.

It is an amenable number.

665432747569 is a deficient number, since it is larger than the sum of its proper divisors (1).

665432747569 is an equidigital number, since it uses as much as digits as its factorization.

665432747569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 228614400, while the sum is 64.

The spelling of 665432747569 in words is "six hundred sixty-five billion, four hundred thirty-two million, seven hundred forty-seven thousand, five hundred sixty-nine".