265640521066432 has 224 divisors, whose sum is σ = 591128817638400. Its totient is φ = 117884927397888.

The previous prime is 265640521066399. The next prime is 265640521066477. The reversal of 265640521066432 is 234660125046562.

It is a self number, because there is not a number n which added to its sum of digits gives 265640521066432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 478572483 + ... + 479127229.

Almost surely, 2^{265640521066432} 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 265640521066432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295564408819200).

265640521066432 is an abundant number, since it is smaller than the sum of its proper divisors (325488296571968).

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

265640521066432 is a wasteful number, since it uses less digits than its factorization.

265640521066432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555211 (or 555201 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 52.

The spelling of 265640521066432 in words is "two hundred sixty-five trillion, six hundred forty billion, five hundred twenty-one million, sixty-six thousand, four hundred thirty-two".