2560256557 has 2 divisors, whose sum is σ = 2560256558. Its totient is φ = 2560256556.

The previous prime is 2560256539. The next prime is 2560256563. The reversal of 2560256557 is 7556520652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1930196356 + 630060201 = 43934^2 + 25101^2 .

It is a cyclic number.

It is not a de Polignac number, because 2560256557 - 2¹¹ = 2560254509 is a prime.

It is a super-2 number, since 2×2560256557² = 13109827275322988498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2560256527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280128278 + 1280128279.

It is an arithmetic number, because the mean of its divisors is an integer number (1280128279).

Almost surely, 2^2560256557 is an apocalyptic number.

It is an amenable number.

2560256557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2560256557 is an equidigital number, since it uses as much as digits as its factorization.

2560256557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630000, while the sum is 43.

The square root of 2560256557 is about 50598.9778256439. The cubic root of 2560256557 is about 1368.0264543876.

The spelling of 2560256557 in words is "two billion, five hundred sixty million, two hundred fifty-six thousand, five hundred fifty-seven".