16228181844 has 120 divisors (see below), whose sum is σ = 51336331200. Its totient is φ = 4363870464.

The previous prime is 16228181813. The next prime is 16228181863. The reversal of 16228181844 is 44818182261.

16228181844 is a `hidden beast` number, since 1 + 622 + 8 + 1 + 8 + 18 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 16228181844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 171894 + ... + 249005.

It is an arithmetic number, because the mean of its divisors is an integer number (427802760).

Almost surely, 2^16228181844 is an apocalyptic number.

16228181844 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16228181844 is an abundant number, since it is smaller than the sum of its proper divisors (35108149356).

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

16228181844 is a wasteful number, since it uses less digits than its factorization.

16228181844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420939 (or 420928 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The spelling of 16228181844 in words is "sixteen billion, two hundred twenty-eight million, one hundred eighty-one thousand, eight hundred forty-four".