1265634536 has 64 divisors (see below), whose sum is σ = 2535624000. Its totient is φ = 590561280.

The previous prime is 1265634533. The next prime is 1265634571. The reversal of 1265634536 is 6354365621.

It is a junction number, because it is equal to n+sod(n) for n = 1265634493 and 1265634502.

It is not an unprimeable number, because it can be changed into a prime (1265634533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4924520 + ... + 4924776.

It is an arithmetic number, because the mean of its divisors is an integer number (39619125).

Almost surely, 2^1265634536 is an apocalyptic number.

It is an amenable number.

1265634536 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

1265634536 is a wasteful number, since it uses less digits than its factorization.

1265634536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 638 counting only the distinct ones).

The product of its digits is 388800, while the sum is 41.

The square root of 1265634536 is about 35575.7577009963. The cubic root of 1265634536 is about 1081.6898944234.

The spelling of 1265634536 in words is "one billion, two hundred sixty-five million, six hundred thirty-four thousand, five hundred thirty-six".