218899547249 has 2 divisors, whose sum is σ = 218899547250. Its totient is φ = 218899547248.

The previous prime is 218899547197. The next prime is 218899547263. The reversal of 218899547249 is 942745998812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214213460224 + 4686087025 = 462832^2 + 68455^2 .

It is a cyclic number.

It is not a de Polignac number, because 218899547249 - 2⁸ = 218899546993 is a prime.

It is not a weakly prime, because it can be changed into another prime (218899543249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109449773624 + 109449773625.

It is an arithmetic number, because the mean of its divisors is an integer number (109449773625).

Almost surely, 2^218899547249 is an apocalyptic number.

It is an amenable number.

218899547249 is a deficient number, since it is larger than the sum of its proper divisors (1).

218899547249 is an equidigital number, since it uses as much as digits as its factorization.

218899547249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104509440, while the sum is 68.

The spelling of 218899547249 in words is "two hundred eighteen billion, eight hundred ninety-nine million, five hundred forty-seven thousand, two hundred forty-nine".