199044281018 has 24 divisors (see below), whose sum is σ = 328478658816. Its totient is φ = 90391320360.

The previous prime is 199044281011. The next prime is 199044281027. The reversal of 199044281018 is 810182440991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (199044281011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115280 + ... + 641387.

It is an arithmetic number, because the mean of its divisors is an integer number (13686610784).

Almost surely, 2^199044281018 is an apocalyptic number.

199044281018 is a deficient number, since it is larger than the sum of its proper divisors (129434377798).

199044281018 is a wasteful number, since it uses less digits than its factorization.

199044281018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757778 (or 757767 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 47.

The spelling of 199044281018 in words is "one hundred ninety-nine billion, forty-four million, two hundred eighty-one thousand, eighteen".