10218660689 has 2 divisors, whose sum is σ = 10218660690. Its totient is φ = 10218660688.

The previous prime is 10218660677. The next prime is 10218660691. The reversal of 10218660689 is 98606681201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9018731089 + 1199929600 = 94967^2 + 34640^2 .

It is a cyclic number.

It is not a de Polignac number, because 10218660689 - 2²⁰ = 10217612113 is a prime.

It is a Sophie Germain prime.

Together with 10218660691, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (10218660659) 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 as a sum of consecutive naturals, namely, 5109330344 + 5109330345.

It is an arithmetic number, because the mean of its divisors is an integer number (5109330345).

Almost surely, 2^10218660689 is an apocalyptic number.

It is an amenable number.

10218660689 is a deficient number, since it is larger than the sum of its proper divisors (1).

10218660689 is an equidigital number, since it uses as much as digits as its factorization.

10218660689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 10218660689 in words is "ten billion, two hundred eighteen million, six hundred sixty thousand, six hundred eighty-nine".