8366281661 has 2 divisors, whose sum is σ = 8366281662. Its totient is φ = 8366281660.

The previous prime is 8366281631. The next prime is 8366281681. The reversal of 8366281661 is 1661826638.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7363356100 + 1002925561 = 85810^2 + 31669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8366281661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8366281631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4183140830 + 4183140831.

It is an arithmetic number, because the mean of its divisors is an integer number (4183140831).

Almost surely, 2^8366281661 is an apocalyptic number.

It is an amenable number.

8366281661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8366281661 is an equidigital number, since it uses as much as digits as its factorization.

8366281661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 47.

The square root of 8366281661 is about 91467.3803112345. The cubic root of 8366281661 is about 2030.0691298742.

The spelling of 8366281661 in words is "eight billion, three hundred sixty-six million, two hundred eighty-one thousand, six hundred sixty-one".