1265855256 has 32 divisors (see below), whose sum is σ = 3516265200. Its totient is φ = 421951680.

The previous prime is 1265855219. The next prime is 1265855257. The reversal of 1265855256 is 6525585621.

1265855256 is a `hidden beast` number, since 12 + 6 + 585 + 5 + 2 + 56 = 666.

1265855256 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265855257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2930005 + ... + 2930436.

Almost surely, 2^1265855256 is an apocalyptic number.

It is an amenable number.

1265855256 is an abundant number, since it is smaller than the sum of its proper divisors (2250409944).

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

1265855256 is a wasteful number, since it uses less digits than its factorization.

1265855256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5860456 (or 5860446 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The square root of 1265855256 is about 35578.8596781853. The cubic root of 1265855256 is about 1081.7527711094.

It can be divided in two parts, 126585 and 5256, that added together give a triangular number (131841 = T₅₁₃).

The spelling of 1265855256 in words is "one billion, two hundred sixty-five million, eight hundred fifty-five thousand, two hundred fifty-six".