8163520081 has 2 divisors, whose sum is σ = 8163520082. Its totient is φ = 8163520080.

The previous prime is 8163520033. The next prime is 8163520087. The reversal of 8163520081 is 1800253618.

8163520081 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7013225025 + 1150295056 = 83745^2 + 33916^2 .

It is a cyclic number.

It is not a de Polignac number, because 8163520081 - 2²³ = 8155131473 is a prime.

It is a super-2 number, since 2×8163520081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8163520087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4081760040 + 4081760041.

It is an arithmetic number, because the mean of its divisors is an integer number (4081760041).

Almost surely, 2^8163520081 is an apocalyptic number.

It is an amenable number.

8163520081 is a deficient number, since it is larger than the sum of its proper divisors (1).

8163520081 is an equidigital number, since it uses as much as digits as its factorization.

8163520081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 8163520081 is about 90352.2002001058. The cubic root of 8163520081 is about 2013.5348704337.

Adding to 8163520081 its reverse (1800253618), we get a palindrome (9963773699).

The spelling of 8163520081 in words is "eight billion, one hundred sixty-three million, five hundred twenty thousand, eighty-one".