218441405953 has 2 divisors, whose sum is σ = 218441405954. Its totient is φ = 218441405952.

The previous prime is 218441405951. The next prime is 218441405981. The reversal of 218441405953 is 359504144812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156842137089 + 61599268864 = 396033^2 + 248192^2 .

It is a cyclic number.

It is not a de Polignac number, because 218441405953 - 2¹ = 218441405951 is a prime.

Together with 218441405951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (218441405951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109220702976 + 109220702977.

It is an arithmetic number, because the mean of its divisors is an integer number (109220702977).

Almost surely, 2^218441405953 is an apocalyptic number.

It is an amenable number.

218441405953 is a deficient number, since it is larger than the sum of its proper divisors (1).

218441405953 is an equidigital number, since it uses as much as digits as its factorization.

218441405953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 218441405953 in words is "two hundred eighteen billion, four hundred forty-one million, four hundred five thousand, nine hundred fifty-three".