18391416205 has 8 divisors (see below), whose sum is σ = 22115020032. Its totient is φ = 14682919248.

The previous prime is 18391416203. The next prime is 18391416259. The reversal of 18391416205 is 50261419381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18391416205 - 2¹ = 18391416203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18391416203) by changing a digit.

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, 3774037 + ... + 3778906.

It is an arithmetic number, because the mean of its divisors is an integer number (2764377504).

Almost surely, 2^18391416205 is an apocalyptic number.

It is an amenable number.

18391416205 is a deficient number, since it is larger than the sum of its proper divisors (3723603827).

18391416205 is an equidigital number, since it uses as much as digits as its factorization.

18391416205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7553435.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 18391416205 in words is "eighteen billion, three hundred ninety-one million, four hundred sixteen thousand, two hundred five".