265213206440 has 256 divisors, whose sum is σ = 740066181120. Its totient is φ = 83295313920.

The previous prime is 265213206403. The next prime is 265213206443. The reversal of 265213206440 is 44602312562.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 265213206440.

It is not an unprimeable number, because it can be changed into a prime (265213206443) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 391747382 + ... + 391748058.

It is an arithmetic number, because the mean of its divisors is an integer number (2890883520).

Almost surely, 2^265213206440 is an apocalyptic number.

265213206440 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 265213206440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370033090560).

265213206440 is an abundant number, since it is smaller than the sum of its proper divisors (474852974680).

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

265213206440 is a wasteful number, since it uses less digits than its factorization.

265213206440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The spelling of 265213206440 in words is "two hundred sixty-five billion, two hundred thirteen million, two hundred six thousand, four hundred forty".