8360556821 has 2 divisors, whose sum is σ = 8360556822. Its totient is φ = 8360556820.

The previous prime is 8360556817. The next prime is 8360556829. The reversal of 8360556821 is 1286550638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7949683921 + 410872900 = 89161^2 + 20270^2 .

It is a cyclic number.

It is not a de Polignac number, because 8360556821 - 2² = 8360556817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8360556829) 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, 4180278410 + 4180278411.

It is an arithmetic number, because the mean of its divisors is an integer number (4180278411).

Almost surely, 2^8360556821 is an apocalyptic number.

It is an amenable number.

8360556821 is a deficient number, since it is larger than the sum of its proper divisors (1).

8360556821 is an equidigital number, since it uses as much as digits as its factorization.

8360556821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 8360556821 is about 91436.0805207660. The cubic root of 8360556821 is about 2029.6059821551.

The spelling of 8360556821 in words is "eight billion, three hundred sixty million, five hundred fifty-six thousand, eight hundred twenty-one".