8638666646 has 64 divisors (see below), whose sum is σ = 14495072256. Its totient is φ = 3847219200.

The previous prime is 8638666639. The next prime is 8638666651. The reversal of 8638666646 is 6466668368.

8638666646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×8638666646² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4087286 + ... + 4089398.

It is an arithmetic number, because the mean of its divisors is an integer number (226485504).

Almost surely, 2^8638666646 is an apocalyptic number.

8638666646 is a deficient number, since it is larger than the sum of its proper divisors (5856405610).

8638666646 is a wasteful number, since it uses less digits than its factorization.

8638666646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277.

The product of its digits is 35831808, while the sum is 59.

The square root of 8638666646 is about 92944.4277296923. The cubic root of 8638666646 is about 2051.8655748748.

The spelling of 8638666646 in words is "eight billion, six hundred thirty-eight million, six hundred sixty-six thousand, six hundred forty-six".