1265665525 has 24 divisors (see below), whose sum is σ = 1675339200. Its totient is φ = 945705600.

The previous prime is 1265665481. The next prime is 1265665537. The reversal of 1265665525 is 5255665621.

It is not a de Polignac number, because 1265665525 - 2⁹ = 1265665013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14961 + ... + 52489.

It is an arithmetic number, because the mean of its divisors is an integer number (69805800).

Almost surely, 2^1265665525 is an apocalyptic number.

It is an amenable number.

1265665525 is a deficient number, since it is larger than the sum of its proper divisors (409673675).

1265665525 is a wasteful number, since it uses less digits than its factorization.

1265665525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37629 (or 37624 counting only the distinct ones).

The product of its digits is 540000, while the sum is 43.

The square root of 1265665525 is about 35576.1932336781. The cubic root of 1265665525 is about 1081.6987227261.

The spelling of 1265665525 in words is "one billion, two hundred sixty-five million, six hundred sixty-five thousand, five hundred twenty-five".