218886429649 has 2 divisors, whose sum is σ = 218886429650. Its totient is φ = 218886429648.

The previous prime is 218886429631. The next prime is 218886429653. The reversal of 218886429649 is 946924688812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124145589649 + 94740840000 = 352343^2 + 307800^2 .

It is a cyclic number.

It is not a de Polignac number, because 218886429649 - 2¹⁹ = 218885905361 is a prime.

It is a super-2 number, since 2×218886429649² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (218886424649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109443214824 + 109443214825.

It is an arithmetic number, because the mean of its divisors is an integer number (109443214825).

Almost surely, 2^218886429649 is an apocalyptic number.

It is an amenable number.

218886429649 is a deficient number, since it is larger than the sum of its proper divisors (1).

218886429649 is an equidigital number, since it uses as much as digits as its factorization.

218886429649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95551488, while the sum is 67.

The spelling of 218886429649 in words is "two hundred eighteen billion, eight hundred eighty-six million, four hundred twenty-nine thousand, six hundred forty-nine".