8656663669 has 2 divisors, whose sum is σ = 8656663670. Its totient is φ = 8656663668.

The previous prime is 8656663661. The next prime is 8656663703. The reversal of 8656663669 is 9663666568.

8656663669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4894681444 + 3761982225 = 69962^2 + 61335^2 .

It is a cyclic number.

It is not a de Polignac number, because 8656663669 - 2³ = 8656663661 is a prime.

It is a super-2 number, since 2×8656663669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8656663661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4328331834 + 4328331835.

It is an arithmetic number, because the mean of its divisors is an integer number (4328331835).

Almost surely, 2^8656663669 is an apocalyptic number.

It is an amenable number.

8656663669 is a deficient number, since it is larger than the sum of its proper divisors (1).

8656663669 is an equidigital number, since it uses as much as digits as its factorization.

8656663669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50388480, while the sum is 61.

The square root of 8656663669 is about 93041.1933984082. The cubic root of 8656663669 is about 2053.2894774013.

The spelling of 8656663669 in words is "eight billion, six hundred fifty-six million, six hundred sixty-three thousand, six hundred sixty-nine".