265912409856 has 144 divisors (see below), whose sum is σ = 742310682624. Its totient is φ = 84406505472.

The previous prime is 265912409797. The next prime is 265912409897. The reversal of 265912409856 is 658904219562.

It is a junction number, because it is equal to n+sod(n) for n = 265912409796 and 265912409805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1236001 + ... + 1435103.

It is an arithmetic number, because the mean of its divisors is an integer number (5154935296).

Almost surely, 2^265912409856 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 265912409856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371155341312).

265912409856 is an abundant number, since it is smaller than the sum of its proper divisors (476398272768).

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

265912409856 is a wasteful number, since it uses less digits than its factorization.

265912409856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199206 (or 199192 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 57.

The spelling of 265912409856 in words is "two hundred sixty-five billion, nine hundred twelve million, four hundred nine thousand, eight hundred fifty-six".