265240513123664 has 120 divisors (see below), whose sum is σ = 580750147468800. Its totient is φ = 117079976572416.

The previous prime is 265240513123643. The next prime is 265240513123667. The reversal of 265240513123664 is 466321315042562.

It is a super-2 number, since 2×265240513123664² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265240513123667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 455763137 + ... + 456344735.

It is an arithmetic number, because the mean of its divisors is an integer number (4839584562240).

Almost surely, 2^{265240513123664} 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 265240513123664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290375073734400).

265240513123664 is an abundant number, since it is smaller than the sum of its proper divisors (315509634345136).

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

265240513123664 is a wasteful number, since it uses less digits than its factorization.

265240513123664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588989 (or 588970 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 50.

The spelling of 265240513123664 in words is "two hundred sixty-five trillion, two hundred forty billion, five hundred thirteen million, one hundred twenty-three thousand, six hundred sixty-four".