218587249409 has 2 divisors, whose sum is σ = 218587249410. Its totient is φ = 218587249408.

The previous prime is 218587249403. The next prime is 218587249499. The reversal of 218587249409 is 904942785812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218299200625 + 288048784 = 467225^2 + 16972^2 .

It is a cyclic number.

It is not a de Polignac number, because 218587249409 - 2²⁴ = 218570472193 is a prime.

It is not a weakly prime, because it can be changed into another prime (218587249403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109293624704 + 109293624705.

It is an arithmetic number, because the mean of its divisors is an integer number (109293624705).

Almost surely, 2^218587249409 is an apocalyptic number.

It is an amenable number.

218587249409 is a deficient number, since it is larger than the sum of its proper divisors (1).

218587249409 is an equidigital number, since it uses as much as digits as its factorization.

218587249409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 218587249409 in words is "two hundred eighteen billion, five hundred eighty-seven million, two hundred forty-nine thousand, four hundred nine".