16244223138 has 288 divisors, whose sum is σ = 44375184000. Its totient is φ = 4375166400.

The previous prime is 16244223137. The next prime is 16244223157. The reversal of 16244223138 is 83132244261.

16244223138 is a `hidden beast` number, since 1 + 62 + 442 + 23 + 138 = 666.

It is not an unprimeable number, because it can be changed into a prime (16244223137) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 81629163 + ... + 81629361.

It is an arithmetic number, because the mean of its divisors is an integer number (154080500).

Almost surely, 2^16244223138 is an apocalyptic number.

16244223138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16244223138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22187592000).

16244223138 is an abundant number, since it is smaller than the sum of its proper divisors (28130960862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16244223138 is a wasteful number, since it uses less digits than its factorization.

16244223138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 259 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

Adding to 16244223138 its reverse (83132244261), we get a palindrome (99376467399).

The spelling of 16244223138 in words is "sixteen billion, two hundred forty-four million, two hundred twenty-three thousand, one hundred thirty-eight".