2556891125 has 8 divisors (see below), whose sum is σ = 3191000280. Its totient is φ = 2045512800.

The previous prime is 2556891089. The next prime is 2556891131. The reversal of 2556891125 is 5211986552.

It can be written as a sum of positive squares in 4 ways, for example, as 24990001 + 2531901124 = 4999^2 + 50318^2 .

It is not a de Polignac number, because 2556891125 - 2¹² = 2556887029 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10227440 + ... + 10227689.

It is an arithmetic number, because the mean of its divisors is an integer number (398875035).

Almost surely, 2^2556891125 is an apocalyptic number.

2556891125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2556891125 is a deficient number, since it is larger than the sum of its proper divisors (634109155).

2556891125 is an equidigital number, since it uses as much as digits as its factorization.

2556891125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20455144 (or 20455134 counting only the distinct ones).

The product of its digits is 216000, while the sum is 44.

The square root of 2556891125 is about 50565.7109610851. The cubic root of 2556891125 is about 1367.4267724570.

The spelling of 2556891125 in words is "two billion, five hundred fifty-six million, eight hundred ninety-one thousand, one hundred twenty-five".