5056156561 has 2 divisors, whose sum is σ = 5056156562. Its totient is φ = 5056156560.

The previous prime is 5056156559. The next prime is 5056156603. The reversal of 5056156561 is 1656516505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3511273536 + 1544883025 = 59256^2 + 39305^2 .

It is a cyclic number.

It is not a de Polignac number, because 5056156561 - 2¹ = 5056156559 is a prime.

Together with 5056156559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (5056156361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2528078280 + 2528078281.

It is an arithmetic number, because the mean of its divisors is an integer number (2528078281).

Almost surely, 2^5056156561 is an apocalyptic number.

It is an amenable number.

5056156561 is a deficient number, since it is larger than the sum of its proper divisors (1).

5056156561 is an equidigital number, since it uses as much as digits as its factorization.

5056156561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135000, while the sum is 40.

The square root of 5056156561 is about 71106.6562355452. The cubic root of 5056156561 is about 1716.3538862993.

The spelling of 5056156561 in words is "five billion, fifty-six million, one hundred fifty-six thousand, five hundred sixty-one".