2155865133 has 16 divisors (see below), whose sum is σ = 3024014400. Its totient is φ = 1364160000.

The previous prime is 2155865123. The next prime is 2155865143. The reversal of 2155865133 is 3315685512.

2155865133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2155865123) and next prime (2155865143).

It is not a de Polignac number, because 2155865133 - 2¹⁸ = 2155602989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2155865091 and 2155865100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155865113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204868 + ... + 215133.

It is an arithmetic number, because the mean of its divisors is an integer number (189000900).

Almost surely, 2^2155865133 is an apocalyptic number.

It is an amenable number.

2155865133 is a deficient number, since it is larger than the sum of its proper divisors (868149267).

2155865133 is a wasteful number, since it uses less digits than its factorization.

2155865133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420092.

The product of its digits is 108000, while the sum is 39.

The square root of 2155865133 is about 46431.2947590308. The cubic root of 2155865133 is about 1291.8354444530.

The spelling of 2155865133 in words is "two billion, one hundred fifty-five million, eight hundred sixty-five thousand, one hundred thirty-three".