8664783649 has 4 divisors (see below), whose sum is σ = 8695619460. Its totient is φ = 8633947840.

The previous prime is 8664783641. The next prime is 8664783683. The reversal of 8664783649 is 9463874668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7672533649 + 992250000 = 87593^2 + 31500^2 .

It is a cyclic number.

It is not a de Polignac number, because 8664783649 - 2³ = 8664783641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8664783641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15417484 + ... + 15418045.

It is an arithmetic number, because the mean of its divisors is an integer number (2173904865).

Almost surely, 2^8664783649 is an apocalyptic number.

It is an amenable number.

8664783649 is a deficient number, since it is larger than the sum of its proper divisors (30835811).

8664783649 is a wasteful number, since it uses less digits than its factorization.

8664783649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30835810.

The product of its digits is 41803776, while the sum is 61.

The square root of 8664783649 is about 93084.8196485335. The cubic root of 8664783649 is about 2053.9312742812.

The spelling of 8664783649 in words is "eight billion, six hundred sixty-four million, seven hundred eighty-three thousand, six hundred forty-nine".