265640660364663 has 32 divisors (see below), whose sum is σ = 405817034188800. Its totient is φ = 171643045902048.

The previous prime is 265640660364649. The next prime is 265640660364679. The reversal of 265640660364663 is 366463066046562.

It is a happy number.

265640660364663 is a `hidden beast` number, since 2 + 6 + 56 + 406 + 60 + 3 + 64 + 6 + 63 = 666.

It is not a de Polignac number, because 265640660364663 - 2⁹ = 265640660364151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 265640660364663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265640660314663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1016037748 + ... + 1016299161.

It is an arithmetic number, because the mean of its divisors is an integer number (12681782318400).

Almost surely, 2^{265640660364663} is an apocalyptic number.

265640660364663 is a deficient number, since it is larger than the sum of its proper divisors (140176373824137).

265640660364663 is a wasteful number, since it uses less digits than its factorization.

265640660364663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032337068 (or 2032337062 counting only the distinct ones).

The product of its (nonzero) digits is 403107840, while the sum is 63.

The spelling of 265640660364663 in words is "two hundred sixty-five trillion, six hundred forty billion, six hundred sixty million, three hundred sixty-four thousand, six hundred sixty-three".