1265445265 has 32 divisors (see below), whose sum is σ = 1795147776. Its totient is φ = 838010880.

The previous prime is 1265445227. The next prime is 1265445301. The reversal of 1265445265 is 5625445621.

It is a happy number.

It is not a de Polignac number, because 1265445265 - 2⁹ = 1265444753 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 729339 + ... + 731071.

It is an arithmetic number, because the mean of its divisors is an integer number (56098368).

Almost surely, 2^1265445265 is an apocalyptic number.

It is an amenable number.

1265445265 is a deficient number, since it is larger than the sum of its proper divisors (529702511).

1265445265 is a wasteful number, since it uses less digits than its factorization.

1265445265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2449.

The product of its digits is 288000, while the sum is 40.

The square root of 1265445265 is about 35573.0974895355. The cubic root of 1265445265 is about 1081.6359708173.

The spelling of 1265445265 in words is "one billion, two hundred sixty-five million, four hundred forty-five thousand, two hundred sixty-five".