265640660364664 has 256 divisors, whose sum is σ = 555377705164800. Its totient is φ = 118363211366400.

The previous prime is 265640660364649. The next prime is 265640660364679. The reversal of 265640660364664 is 466463066046562.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (265640660364649) and next prime (265640660364679).

It is a junction number, because it is equal to n+sod(n) for n = 265640660364596 and 265640660364605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 41918990104 + ... + 41918996440.

It is an arithmetic number, because the mean of its divisors is an integer number (2169444160800).

Almost surely, 2^{265640660364664} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265640660364664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277688852582400).

265640660364664 is an abundant number, since it is smaller than the sum of its proper divisors (289737044800136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265640660364664 is a wasteful number, since it uses less digits than its factorization.

265640660364664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7054 (or 7050 counting only the distinct ones).

The product of its (nonzero) digits is 537477120, while the sum is 64.

The spelling of 265640660364664 in words is "two hundred sixty-five trillion, six hundred forty billion, six hundred sixty million, three hundred sixty-four thousand, six hundred sixty-four".