1272852665 has 12 divisors (see below), whose sum is σ = 1776798756. Its totient is φ = 872813088.

The previous prime is 1272852649. The next prime is 1272852673. The reversal of 1272852665 is 5662582721.

It can be written as a sum of positive squares in 2 ways, for example, as 616826896 + 656025769 = 24836^2 + 25613^2 .

It is not a de Polignac number, because 1272852665 - 2⁴ = 1272852649 is a prime.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 2597414 + ... + 2597903.

It is an arithmetic number, because the mean of its divisors is an integer number (148066563).

Almost surely, 2^1272852665 is an apocalyptic number.

It is an amenable number.

1272852665 is a deficient number, since it is larger than the sum of its proper divisors (503946091).

1272852665 is an equidigital number, since it uses as much as digits as its factorization.

1272852665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5195336 (or 5195329 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 1272852665 is about 35677.0607673895. The cubic root of 1272852665 is about 1083.7423513263.

The spelling of 1272852665 in words is "one billion, two hundred seventy-two million, eight hundred fifty-two thousand, six hundred sixty-five".