8167810561 has 2 divisors, whose sum is σ = 8167810562. Its totient is φ = 8167810560.

The previous prime is 8167810559. The next prime is 8167810579. The reversal of 8167810561 is 1650187618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8166556161 + 1254400 = 90369^2 + 1120^2 .

It is a cyclic number.

It is not a de Polignac number, because 8167810561 - 2¹ = 8167810559 is a prime.

Together with 8167810559, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (8167810501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4083905280 + 4083905281.

It is an arithmetic number, because the mean of its divisors is an integer number (4083905281).

Almost surely, 2^8167810561 is an apocalyptic number.

It is an amenable number.

8167810561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8167810561 is an equidigital number, since it uses as much as digits as its factorization.

8167810561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 43.

The square root of 8167810561 is about 90375.9401666174. The cubic root of 8167810561 is about 2013.8875580808.

The spelling of 8167810561 in words is "eight billion, one hundred sixty-seven million, eight hundred ten thousand, five hundred sixty-one".