16123881338 has 4 divisors (see below), whose sum is σ = 24185822010. Its totient is φ = 8061940668.

The previous prime is 16123881331. The next prime is 16123881379. The reversal of 16123881338 is 83318832161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83318832161 = 53 ⋅1572053437.

It can be written as a sum of positive squares in only one way, i.e., 13378854889 + 2745026449 = 115667^2 + 52393^2 .

It is not an unprimeable number, because it can be changed into a prime (16123881331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4030970333 + ... + 4030970336.

Almost surely, 2^16123881338 is an apocalyptic number.

16123881338 is a deficient number, since it is larger than the sum of its proper divisors (8061940672).

16123881338 is an equidigital number, since it uses as much as digits as its factorization.

16123881338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8061940671.

The product of its digits is 165888, while the sum is 44.

The spelling of 16123881338 in words is "sixteen billion, one hundred twenty-three million, eight hundred eighty-one thousand, three hundred thirty-eight".