2561770163 has 2 divisors, whose sum is σ = 2561770164. Its totient is φ = 2561770162.

The previous prime is 2561770111. The next prime is 2561770207. The reversal of 2561770163 is 3610771652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2561770163 - 2⁸ = 2561769907 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2561770663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280885081 + 1280885082.

It is an arithmetic number, because the mean of its divisors is an integer number (1280885082).

Almost surely, 2^2561770163 is an apocalyptic number.

2561770163 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561770163 is an equidigital number, since it uses as much as digits as its factorization.

2561770163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 2561770163 is about 50613.9324988683. The cubic root of 2561770163 is about 1368.2959905436.

The spelling of 2561770163 in words is "two billion, five hundred sixty-one million, seven hundred seventy thousand, one hundred sixty-three".