2155645325 has 24 divisors (see below), whose sum is σ = 2701756392. Its totient is φ = 1706065920.

The previous prime is 2155645319. The next prime is 2155645343. The reversal of 2155645325 is 5235465512.

It can be written as a sum of positive squares in 12 ways, for example, as 680009929 + 1475635396 = 26077^2 + 38414^2 .

It is not a de Polignac number, because 2155645325 - 2¹⁰ = 2155644301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1007657 + ... + 1009793.

It is an arithmetic number, because the mean of its divisors is an integer number (112573183).

Almost surely, 2^2155645325 is an apocalyptic number.

2155645325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2155645325 is a deficient number, since it is larger than the sum of its proper divisors (546111067).

2155645325 is a wasteful number, since it uses less digits than its factorization.

2155645325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561 (or 2556 counting only the distinct ones).

The product of its digits is 180000, while the sum is 38.

The square root of 2155645325 is about 46428.9276744574. The cubic root of 2155645325 is about 1291.7915385809.

The spelling of 2155645325 in words is "two billion, one hundred fifty-five million, six hundred forty-five thousand, three hundred twenty-five".