8689998649 has 2 divisors, whose sum is σ = 8689998650. Its totient is φ = 8689998648.

The previous prime is 8689998623. The next prime is 8689998661. The reversal of 8689998649 is 9468999868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6304360000 + 2385638649 = 79400^2 + 48843^2 .

It is a cyclic number.

It is not a de Polignac number, because 8689998649 - 2⁵ = 8689998617 is a prime.

It is not a weakly prime, because it can be changed into another prime (8689998689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4344999324 + 4344999325.

It is an arithmetic number, because the mean of its divisors is an integer number (4344999325).

Almost surely, 2^8689998649 is an apocalyptic number.

It is an amenable number.

8689998649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8689998649 is an equidigital number, since it uses as much as digits as its factorization.

8689998649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483729408, while the sum is 76.

The square root of 8689998649 is about 93220.1622450852. The cubic root of 8689998649 is about 2055.9216960121.

The spelling of 8689998649 in words is "eight billion, six hundred eighty-nine million, nine hundred ninety-eight thousand, six hundred forty-nine".