1265265125 has 32 divisors (see below), whose sum is σ = 1625315328. Its totient is φ = 982800000.

The previous prime is 1265265109. The next prime is 1265265139. The reversal of 1265265125 is 5215625621.

It is not a de Polignac number, because 1265265125 - 2⁴ = 1265265109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1388420 + ... + 1389330.

It is an arithmetic number, because the mean of its divisors is an integer number (50791104).

Almost surely, 2^1265265125 is an apocalyptic number.

It is an amenable number.

1265265125 is a deficient number, since it is larger than the sum of its proper divisors (360050203).

1265265125 is an equidigital number, since it uses as much as digits as its factorization.

1265265125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238 (or 1228 counting only the distinct ones).

The product of its digits is 36000, while the sum is 35.

The square root of 1265265125 is about 35570.5654298607. The cubic root of 1265265125 is about 1081.5846436532.

It can be divided in two parts, 12652 and 65125, that added together give a palindrome (77777).

The spelling of 1265265125 in words is "one billion, two hundred sixty-five million, two hundred sixty-five thousand, one hundred twenty-five".