8631660217 has 4 divisors (see below), whose sum is σ = 8635580560. Its totient is φ = 8627739876.

The previous prime is 8631660211. The next prime is 8631660241. The reversal of 8631660217 is 7120661368.

It is a happy number.

8631660217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8631660217 - 2²⁷ = 8497442489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8631660217.

It is not an unprimeable number, because it can be changed into a prime (8631660211) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1956867 + ... + 1961272.

It is an arithmetic number, because the mean of its divisors is an integer number (2158895140).

Almost surely, 2^8631660217 is an apocalyptic number.

It is an amenable number.

8631660217 is a deficient number, since it is larger than the sum of its proper divisors (3920343).

8631660217 is a wasteful number, since it uses less digits than its factorization.

8631660217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920342.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 8631660217 is about 92906.7285884074. The cubic root of 8631660217 is about 2051.3106999367.

The spelling of 8631660217 in words is "eight billion, six hundred thirty-one million, six hundred sixty thousand, two hundred seventeen".