218906707109 has 2 divisors, whose sum is σ = 218906707110. Its totient is φ = 218906707108.

The previous prime is 218906707087. The next prime is 218906707177. The reversal of 218906707109 is 901707609812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117445346209 + 101461360900 = 342703^2 + 318530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218906707109 is a prime.

It is a super-2 number, since 2×218906707109² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (218906707199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109453353554 + 109453353555.

It is an arithmetic number, because the mean of its divisors is an integer number (109453353555).

Almost surely, 2^218906707109 is an apocalyptic number.

It is an amenable number.

218906707109 is a deficient number, since it is larger than the sum of its proper divisors (1).

218906707109 is an equidigital number, since it uses as much as digits as its factorization.

218906707109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 50.

The spelling of 218906707109 in words is "two hundred eighteen billion, nine hundred six million, seven hundred seven thousand, one hundred nine".