18444507890 has 16 divisors (see below), whose sum is σ = 33528830040. Its totient is φ = 7304755200.

The previous prime is 18444507883. The next prime is 18444507919. The reversal of 18444507890 is 9870544481.

It can be written as a sum of positive squares in 4 ways, for example, as 13395979081 + 5048528809 = 115741^2 + 71053^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9129935 + ... + 9131954.

Almost surely, 2^18444507890 is an apocalyptic number.

18444507890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18444507890 is a deficient number, since it is larger than the sum of its proper divisors (15084322150).

18444507890 is a wasteful number, since it uses less digits than its factorization.

18444507890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18261997.

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 18444507890 in words is "eighteen billion, four hundred forty-four million, five hundred seven thousand, eight hundred ninety".