19440633218 has 32 divisors (see below), whose sum is σ = 31368349440. Its totient is φ = 9007182720.

The previous prime is 19440633187. The next prime is 19440633221. The reversal of 19440633218 is 81233604491.

It is a super-3 number, since 3×19440633218³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4679030 + ... + 4683182.

It is an arithmetic number, because the mean of its divisors is an integer number (980260920).

Almost surely, 2^19440633218 is an apocalyptic number.

19440633218 is a deficient number, since it is larger than the sum of its proper divisors (11927716222).

19440633218 is a wasteful number, since it uses less digits than its factorization.

19440633218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6842.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 19440633218 in words is "nineteen billion, four hundred forty million, six hundred thirty-three thousand, two hundred eighteen".