918446221439999 has 32 divisors (see below), whose sum is σ = 1096009464000000. Its totient is φ = 768913164355392.

The previous prime is 918446221439947. The next prime is 918446221440001. The reversal of 918446221439999 is 999934122644819.

It is not a de Polignac number, because 918446221439999 - 2¹⁶ = 918446221374463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918446221439699) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 628300052 + ... + 629760150.

It is an arithmetic number, because the mean of its divisors is an integer number (34250295750000).

Almost surely, 2^{918446221439999} is an apocalyptic number.

918446221439999 is a deficient number, since it is larger than the sum of its proper divisors (177563242560001).

918446221439999 is a wasteful number, since it uses less digits than its factorization.

918446221439999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502812 (or 1502798 counting only the distinct ones).

The product of its digits is 2176782336, while the sum is 80.

The spelling of 918446221439999 in words is "nine hundred eighteen trillion, four hundred forty-six billion, two hundred twenty-one million, four hundred thirty-nine thousand, nine hundred ninety-nine".