8210706222661 has 2 divisors, whose sum is σ = 8210706222662. Its totient is φ = 8210706222660.

The previous prime is 8210706222659. The next prime is 8210706222673. The reversal of 8210706222661 is 1662226070128.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8070769628100 + 139936594561 = 2840910^2 + 374081^2 .

It is a cyclic number.

It is not a de Polignac number, because 8210706222661 - 2¹ = 8210706222659 is a prime.

Together with 8210706222659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8210706622661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4105353111330 + 4105353111331.

It is an arithmetic number, because the mean of its divisors is an integer number (4105353111331).

Almost surely, 2^{8210706222661} is an apocalyptic number.

It is an amenable number.

8210706222661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8210706222661 is an equidigital number, since it uses as much as digits as its factorization.

8210706222661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 8210706222661 in words is "eight trillion, two hundred ten billion, seven hundred six million, two hundred twenty-two thousand, six hundred sixty-one".