2155756225 has 36 divisors (see below), whose sum is σ = 3125702844. Its totient is φ = 1470564480.

The previous prime is 2155756201. The next prime is 2155756231. The reversal of 2155756225 is 5226575512.

It can be written as a sum of positive squares in 6 ways, for example, as 5764801 + 2149991424 = 2401^2 + 46368^2 .

It is not a de Polignac number, because 2155756225 - 2¹¹ = 2155754177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 236859 + ... + 245791.

It is an arithmetic number, because the mean of its divisors is an integer number (86825079).

Almost surely, 2^2155756225 is an apocalyptic number.

2155756225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2155756225 is a deficient number, since it is larger than the sum of its proper divisors (969946619).

2155756225 is a wasteful number, since it uses less digits than its factorization.

2155756225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9154 (or 9142 counting only the distinct ones).

The product of its digits is 210000, while the sum is 40.

The square root of 2155756225 is about 46430.1219576257. The cubic root of 2155756225 is about 1291.8136908374.

The spelling of 2155756225 in words is "two billion, one hundred fifty-five million, seven hundred fifty-six thousand, two hundred twenty-five".