2560557521 has 2 divisors, whose sum is σ = 2560557522. Its totient is φ = 2560557520.

The previous prime is 2560557487. The next prime is 2560557529. The reversal of 2560557521 is 1257550652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2548230400 + 12327121 = 50480^2 + 3511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2560557521 - 2¹⁸ = 2560295377 is a prime.

It is not a weakly prime, because it can be changed into another prime (2560557529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280278760 + 1280278761.

It is an arithmetic number, because the mean of its divisors is an integer number (1280278761).

Almost surely, 2^2560557521 is an apocalyptic number.

It is an amenable number.

2560557521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2560557521 is an equidigital number, since it uses as much as digits as its factorization.

2560557521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105000, while the sum is 38.

The square root of 2560557521 is about 50601.9517508959. The cubic root of 2560557521 is about 1368.0800571644.

The spelling of 2560557521 in words is "two billion, five hundred sixty million, five hundred fifty-seven thousand, five hundred twenty-one".