18444394870 has 16 divisors (see below), whose sum is σ = 36218084688. Its totient is φ = 6707052640.

The previous prime is 18444394867. The next prime is 18444394879. The reversal of 18444394870 is 7849344481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18444394879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83838049 + ... + 83838268.

It is an arithmetic number, because the mean of its divisors is an integer number (2263630293).

Almost surely, 2^18444394870 is an apocalyptic number.

18444394870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18444394870 is a deficient number, since it is larger than the sum of its proper divisors (17773689818).

18444394870 is a wasteful number, since it uses less digits than its factorization.

18444394870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167676335.

The product of its (nonzero) digits is 3096576, while the sum is 52.

It can be divided in two parts, 18444 and 394870, that added together give a palindrome (413314).

The spelling of 18444394870 in words is "eighteen billion, four hundred forty-four million, three hundred ninety-four thousand, eight hundred seventy".