265640660364649 has 2 divisors, whose sum is σ = 265640660364650. Its totient is φ = 265640660364648.

The previous prime is 265640660364503. The next prime is 265640660364679. The reversal of 265640660364649 is 946463066046562.

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., 236259187025625 + 29381473339024 = 15370725^2 + 5420468^2 .

It is a cyclic number.

It is not a de Polignac number, because 265640660364649 - 2¹³ = 265640660356457 is a prime.

It is not a weakly prime, because it can be changed into another prime (265640660364679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132820330182324 + 132820330182325.

It is an arithmetic number, because the mean of its divisors is an integer number (132820330182325).

Almost surely, 2^{265640660364649} is an apocalyptic number.

It is an amenable number.

265640660364649 is a deficient number, since it is larger than the sum of its proper divisors (1).

265640660364649 is an equidigital number, since it uses as much as digits as its factorization.

265640660364649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 806215680, while the sum is 67.

The spelling of 265640660364649 in words is "two hundred sixty-five trillion, six hundred forty billion, six hundred sixty million, three hundred sixty-four thousand, six hundred forty-nine".