1265305256 has 16 divisors (see below), whose sum is σ = 2475597600. Its totient is φ = 605145904.

The previous prime is 1265305241. The next prime is 1265305259. The reversal of 1265305256 is 6525035621.

It is a super-2 number, since 2×1265305256² = 3201994781722451072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1265305259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3438146 + ... + 3438513.

It is an arithmetic number, because the mean of its divisors is an integer number (154724850).

Almost surely, 2^1265305256 is an apocalyptic number.

It is an amenable number.

1265305256 is a deficient number, since it is larger than the sum of its proper divisors (1210292344).

1265305256 is a wasteful number, since it uses less digits than its factorization.

1265305256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6876688 (or 6876684 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 1265305256 is about 35571.1295294372. The cubic root of 1265305256 is about 1081.5960785727.

The spelling of 1265305256 in words is "one billion, two hundred sixty-five million, three hundred five thousand, two hundred fifty-six".