8216227688881 has 2 divisors, whose sum is σ = 8216227688882. Its totient is φ = 8216227688880.

The previous prime is 8216227688869. The next prime is 8216227688891. The reversal of 8216227688881 is 1888867226128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4268789871025 + 3947437817856 = 2066105^2 + 1986816^2 .

It is a cyclic number.

It is not a de Polignac number, because 8216227688881 - 2²³ = 8216219300273 is a prime.

It is a super-2 number, since 2×8216227688881² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8216227688831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4108113844440 + 4108113844441.

It is an arithmetic number, because the mean of its divisors is an integer number (4108113844441).

Almost surely, 2^{8216227688881} is an apocalyptic number.

It is an amenable number.

8216227688881 is a deficient number, since it is larger than the sum of its proper divisors (1).

8216227688881 is an equidigital number, since it uses as much as digits as its factorization.

8216227688881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66060288, while the sum is 67.

The spelling of 8216227688881 in words is "eight trillion, two hundred sixteen billion, two hundred twenty-seven million, six hundred eighty-eight thousand, eight hundred eighty-one".