5056511561 has 2 divisors, whose sum is σ = 5056511562. Its totient is φ = 5056511560.

The previous prime is 5056511549. The next prime is 5056511563. The reversal of 5056511561 is 1651156505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4906302025 + 150209536 = 70045^2 + 12256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5056511561 is a prime.

Together with 5056511563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5056511563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2528255780 + 2528255781.

It is an arithmetic number, because the mean of its divisors is an integer number (2528255781).

Almost surely, 2^5056511561 is an apocalyptic number.

It is an amenable number.

5056511561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5056511561 is an equidigital number, since it uses as much as digits as its factorization.

5056511561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 35.

The square root of 5056511561 is about 71109.1524418622. The cubic root of 5056511561 is about 1716.3940545814.

It can be divided in two parts, 50565 and 11561, that added together give a palindrome (62126).

The spelling of 5056511561 in words is "five billion, fifty-six million, five hundred eleven thousand, five hundred sixty-one".