8061155561 has 2 divisors, whose sum is σ = 8061155562. Its totient is φ = 8061155560.

The previous prime is 8061155539. The next prime is 8061155563. The reversal of 8061155561 is 1655511608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8057755225 + 3400336 = 89765^2 + 1844^2 .

It is a cyclic number.

It is not a de Polignac number, because 8061155561 - 2³⁰ = 6987413737 is a prime.

It is a Sophie Germain prime.

Together with 8061155563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (8061155563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4030577780 + 4030577781.

It is an arithmetic number, because the mean of its divisors is an integer number (4030577781).

Almost surely, 2^8061155561 is an apocalyptic number.

It is an amenable number.

8061155561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8061155561 is an equidigital number, since it uses as much as digits as its factorization.

8061155561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 8061155561 is about 89783.9382128006. The cubic root of 8061155561 is about 2005.0833655012.

The spelling of 8061155561 in words is "eight billion, sixty-one million, one hundred fifty-five thousand, five hundred sixty-one".