2156533815265 has 16 divisors (see below), whose sum is σ = 2632743632016. Its totient is φ = 1695345004800.

The previous prime is 2156533815229. The next prime is 2156533815277. The reversal of 2156533815265 is 5625183356512.

It can be written as a sum of positive squares in 8 ways, for example, as 18902675169 + 2137631140096 = 137487^2 + 1462064^2 .

It is not a de Polignac number, because 2156533815265 - 2³⁹ = 1606778001377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3008442 + ... + 3655651.

It is an arithmetic number, because the mean of its divisors is an integer number (164546477001).

Almost surely, 2^{2156533815265} is an apocalyptic number.

It is an amenable number.

2156533815265 is a deficient number, since it is larger than the sum of its proper divisors (476209816751).

2156533815265 is a wasteful number, since it uses less digits than its factorization.

2156533815265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6665220.

The product of its digits is 6480000, while the sum is 52.

The spelling of 2156533815265 in words is "two trillion, one hundred fifty-six billion, five hundred thirty-three million, eight hundred fifteen thousand, two hundred sixty-five".