265505258340 has 216 divisors, whose sum is σ = 939819541752. Its totient is φ = 60494837760.

The previous prime is 265505258329. The next prime is 265505258357. The reversal of 265505258340 is 43852505562.

265505258340 is a `hidden beast` number, since 2 + 6 + 5 + 5 + 0 + 525 + 83 + 40 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 22874142564 + 242631115776 = 151242^2 + 492576^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2748460 + ... + 2843420.

It is an arithmetic number, because the mean of its divisors is an integer number (4351016397).

Almost surely, 2^265505258340 is an apocalyptic number.

265505258340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265505258340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469909770876).

265505258340 is an abundant number, since it is smaller than the sum of its proper divisors (674314283412).

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

265505258340 is a wasteful number, since it uses less digits than its factorization.

265505258340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95307 (or 95295 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 45.

The spelling of 265505258340 in words is "two hundred sixty-five billion, five hundred five million, two hundred fifty-eight thousand, three hundred forty".