8668649959 has 4 divisors (see below), whose sum is σ = 8674592920. Its totient is φ = 8662707000.

The previous prime is 8668649953. The next prime is 8668649999. The reversal of 8668649959 is 9599468668.

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

It is a cyclic number.

It is not a de Polignac number, because 8668649959 - 2⁷ = 8668649831 is a prime.

It is a super-2 number, since 2×8668649959² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8668649953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2969292 + ... + 2972209.

It is an arithmetic number, because the mean of its divisors is an integer number (2168648230).

Almost surely, 2^8668649959 is an apocalyptic number.

8668649959 is a deficient number, since it is larger than the sum of its proper divisors (5942961).

8668649959 is a wasteful number, since it uses less digits than its factorization.

8668649959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5942960.

The product of its digits is 201553920, while the sum is 70.

The square root of 8668649959 is about 93105.5850043380. The cubic root of 8668649959 is about 2054.2367234996.

The spelling of 8668649959 in words is "eight billion, six hundred sixty-eight million, six hundred forty-nine thousand, nine hundred fifty-nine".