265867804656 has 280 divisors, whose sum is σ = 785641055040. Its totient is φ = 87107125248.

The previous prime is 265867804621. The next prime is 265867804673. The reversal of 265867804656 is 656408768562.

It is a happy number.

265867804656 is a `hidden beast` number, since 2 + 6 + 586 + 7 + 8 + 0 + 46 + 5 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 265867804593 and 265867804602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 200351865 + ... + 200353191.

Almost surely, 2^265867804656 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 265867804656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392820527520).

265867804656 is an abundant number, since it is smaller than the sum of its proper divisors (519773250384).

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

265867804656 is a wasteful number, since it uses less digits than its factorization.

265867804656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1614 counting only the distinct ones).

The product of its (nonzero) digits is 116121600, while the sum is 63.

The spelling of 265867804656 in words is "two hundred sixty-five billion, eight hundred sixty-seven million, eight hundred four thousand, six hundred fifty-six".