1265477165 has 4 divisors (see below), whose sum is σ = 1518572604. Its totient is φ = 1012381728.

The previous prime is 1265477153. The next prime is 1265477167. The reversal of 1265477165 is 5617745621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5617745621 = 43 ⋅130645247.

It can be written as a sum of positive squares in 2 ways, for example, as 374693449 + 890783716 = 19357^2 + 29846^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265477165 - 2²² = 1261282861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265477167) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 126547712 + ... + 126547721.

It is an arithmetic number, because the mean of its divisors is an integer number (379643151).

Almost surely, 2^1265477165 is an apocalyptic number.

It is an amenable number.

1265477165 is a deficient number, since it is larger than the sum of its proper divisors (253095439).

1265477165 is an equidigital number, since it uses as much as digits as its factorization.

1265477165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253095438.

The product of its digits is 352800, while the sum is 44.

The square root of 1265477165 is about 35573.5458592477. The cubic root of 1265477165 is about 1081.6450595543.

The spelling of 1265477165 in words is "one billion, two hundred sixty-five million, four hundred seventy-seven thousand, one hundred sixty-five".