218017573649 has 2 divisors, whose sum is σ = 218017573650. Its totient is φ = 218017573648.

The previous prime is 218017573583. The next prime is 218017573691. The reversal of 218017573649 is 946375710812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196078039249 + 21939534400 = 442807^2 + 148120^2 .

It is a cyclic number.

It is not a de Polignac number, because 218017573649 - 2⁸ = 218017573393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 218017573649.

It is not a weakly prime, because it can be changed into another prime (218017573699) 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, 109008786824 + 109008786825.

It is an arithmetic number, because the mean of its divisors is an integer number (109008786825).

It is a 2-persistent number, because it is pandigital, and so is 2⋅218017573649 = 436035147298, but 3⋅218017573649 = 654052720947 is not.

Almost surely, 2^218017573649 is an apocalyptic number.

It is an amenable number.

218017573649 is a deficient number, since it is larger than the sum of its proper divisors (1).

218017573649 is an equidigital number, since it uses as much as digits as its factorization.

218017573649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 218017573649 in words is "two hundred eighteen billion, seventeen million, five hundred seventy-three thousand, six hundred forty-nine".