8669999669 has 2 divisors, whose sum is σ = 8669999670. Its totient is φ = 8669999668.

The previous prime is 8669999659. The next prime is 8669999683. The reversal of 8669999669 is 9669999668.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8087404900 + 582594769 = 89930^2 + 24137^2 .

It is a cyclic number.

It is not a de Polignac number, because 8669999669 - 2³² = 4375032373 is a prime.

It is a super-2 number, since 2×8669999669² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8669999669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8669999659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4334999834 + 4334999835.

It is an arithmetic number, because the mean of its divisors is an integer number (4334999835).

Almost surely, 2^8669999669 is an apocalyptic number.

It is an amenable number.

8669999669 is a deficient number, since it is larger than the sum of its proper divisors (1).

8669999669 is an equidigital number, since it uses as much as digits as its factorization.

8669999669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612220032, while the sum is 77.

The square root of 8669999669 is about 93112.8329984648. The cubic root of 8669999669 is about 2054.3433329476.

Subtracting 8669999669 from its reverse (9669999668), we obtain a palindrome (999999999).

The spelling of 8669999669 in words is "eight billion, six hundred sixty-nine million, nine hundred ninety-nine thousand, six hundred sixty-nine".