218008852861 has 2 divisors, whose sum is σ = 218008852862. Its totient is φ = 218008852860.

The previous prime is 218008852849. The next prime is 218008852921. The reversal of 218008852861 is 168258800812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213276788761 + 4732064100 = 461819^2 + 68790^2 .

It is a cyclic number.

It is not a de Polignac number, because 218008852861 - 2⁵ = 218008852829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218008852801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109004426430 + 109004426431.

It is an arithmetic number, because the mean of its divisors is an integer number (109004426431).

Almost surely, 2^218008852861 is an apocalyptic number.

It is an amenable number.

218008852861 is a deficient number, since it is larger than the sum of its proper divisors (1).

218008852861 is an equidigital number, since it uses as much as digits as its factorization.

218008852861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 491520, while the sum is 49.

The spelling of 218008852861 in words is "two hundred eighteen billion, eight million, eight hundred fifty-two thousand, eight hundred sixty-one".