18000043499990 has 32 divisors (see below), whose sum is σ = 32455836220320. Its totient is φ = 7187629204224.

The previous prime is 18000043499989. The next prime is 18000043500059. The reversal of 18000043499990 is 9999434000081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60619124 + ... + 60915336.

It is an arithmetic number, because the mean of its divisors is an integer number (1014244881885).

Almost surely, 2^{18000043499990} is an apocalyptic number.

18000043499990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18000043499990 is a deficient number, since it is larger than the sum of its proper divisors (14455792720330).

18000043499990 is a wasteful number, since it uses less digits than its factorization.

18000043499990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306656.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 18000043499990 in words is "eighteen trillion, forty-three million, four hundred ninety-nine thousand, nine hundred ninety".