2556504251 has 16 divisors (see below), whose sum is σ = 3200264640. Its totient is φ = 1991270400.

The previous prime is 2556504221. The next prime is 2556504253. The reversal of 2556504251 is 1524056552.

It is not a de Polignac number, because 2556504251 - 2¹⁰ = 2556503227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556504253) 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, 366950 + ... + 373851.

It is an arithmetic number, because the mean of its divisors is an integer number (200016540).

Almost surely, 2^2556504251 is an apocalyptic number.

2556504251 is a deficient number, since it is larger than the sum of its proper divisors (643760389).

2556504251 is a wasteful number, since it uses less digits than its factorization.

2556504251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740854.

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 2556504251 is about 50561.8853584397. The cubic root of 2556504251 is about 1367.3578021694.

The spelling of 2556504251 in words is "two billion, five hundred fifty-six million, five hundred four thousand, two hundred fifty-one".