18344040685850 has 48 divisors (see below), whose sum is σ = 37223808595200. Its totient is φ = 6670187059200.

The previous prime is 18344040685757. The next prime is 18344040685853. The reversal of 18344040685850 is 5858604044381.

It is not an unprimeable number, because it can be changed into a prime (18344040685853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9002999 + ... + 10850901.

It is an arithmetic number, because the mean of its divisors is an integer number (775496012400).

Almost surely, 2^{18344040685850} is an apocalyptic number.

18344040685850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18344040685850 is an abundant number, since it is smaller than the sum of its proper divisors (18879767909350).

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

18344040685850 is a wasteful number, since it uses less digits than its factorization.

18344040685850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865975 (or 1865970 counting only the distinct ones).

The product of its (nonzero) digits is 14745600, while the sum is 56.

The spelling of 18344040685850 in words is "eighteen trillion, three hundred forty-four billion, forty million, six hundred eighty-five thousand, eight hundred fifty".