2562805561 has 2 divisors, whose sum is σ = 2562805562. Its totient is φ = 2562805560.

The previous prime is 2562805549. The next prime is 2562805571. The reversal of 2562805561 is 1655082652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1329039936 + 1233765625 = 36456^2 + 35125^2 .

It is a cyclic number.

It is not a de Polignac number, because 2562805561 - 2¹¹ = 2562803513 is a prime.

It is not a weakly prime, because it can be changed into another prime (2562805541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1281402780 + 1281402781.

It is an arithmetic number, because the mean of its divisors is an integer number (1281402781).

Almost surely, 2^2562805561 is an apocalyptic number.

It is an amenable number.

2562805561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2562805561 is an equidigital number, since it uses as much as digits as its factorization.

2562805561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 2562805561 is about 50624.1598547571. The cubic root of 2562805561 is about 1368.4803084197.

The spelling of 2562805561 in words is "two billion, five hundred sixty-two million, eight hundred five thousand, five hundred sixty-one".