665465115541 has 2 divisors, whose sum is σ = 665465115542. Its totient is φ = 665465115540.

The previous prime is 665465115467. The next prime is 665465115559. The reversal of 665465115541 is 145511564566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564833414916 + 100631700625 = 751554^2 + 317225^2 .

It is a cyclic number.

It is not a de Polignac number, because 665465115541 - 2¹⁷ = 665464984469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665465415541) 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, 332732557770 + 332732557771.

It is an arithmetic number, because the mean of its divisors is an integer number (332732557771).

Almost surely, 2^665465115541 is an apocalyptic number.

It is an amenable number.

665465115541 is a deficient number, since it is larger than the sum of its proper divisors (1).

665465115541 is an equidigital number, since it uses as much as digits as its factorization.

665465115541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160000, while the sum is 49.

The spelling of 665465115541 in words is "six hundred sixty-five billion, four hundred sixty-five million, one hundred fifteen thousand, five hundred forty-one".