8664868649 has 2 divisors, whose sum is σ = 8664868650. Its totient is φ = 8664868648.

The previous prime is 8664868523. The next prime is 8664868673. The reversal of 8664868649 is 9468684668.

8664868649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6403200400 + 2261668249 = 80020^2 + 47557^2 .

It is a cyclic number.

It is not a de Polignac number, because 8664868649 - 2¹⁶ = 8664803113 is a prime.

It is not a weakly prime, because it can be changed into another prime (8664868049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4332434324 + 4332434325.

It is an arithmetic number, because the mean of its divisors is an integer number (4332434325).

Almost surely, 2^8664868649 is an apocalyptic number.

It is an amenable number.

8664868649 is a deficient number, since it is larger than the sum of its proper divisors (1).

8664868649 is an equidigital number, since it uses as much as digits as its factorization.

8664868649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95551488, while the sum is 65.

The square root of 8664868649 is about 93085.2762202487. The cubic root of 8664868649 is about 2053.9379904938.

The spelling of 8664868649 in words is "eight billion, six hundred sixty-four million, eight hundred sixty-eight thousand, six hundred forty-nine".