918446221439947 has 2 divisors, whose sum is σ = 918446221439948. Its totient is φ = 918446221439946.

The previous prime is 918446221439933. The next prime is 918446221440001. The reversal of 918446221439947 is 749934122644819.

918446221439947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 918446221439947 - 2⁷ = 918446221439819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 918446221439947.

It is not a weakly prime, because it can be changed into another prime (918446221439917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 459223110719973 + 459223110719974.

It is an arithmetic number, because the mean of its divisors is an integer number (459223110719974).

Almost surely, 2^{918446221439947} is an apocalyptic number.

918446221439947 is a deficient number, since it is larger than the sum of its proper divisors (1).

918446221439947 is an equidigital number, since it uses as much as digits as its factorization.

918446221439947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 752467968, while the sum is 73.

The spelling of 918446221439947 in words is "nine hundred eighteen trillion, four hundred forty-six billion, two hundred twenty-one million, four hundred thirty-nine thousand, nine hundred forty-seven".