18406416859 has 4 divisors (see below), whose sum is σ = 18434263840. Its totient is φ = 18378569880.

The previous prime is 18406416857. The next prime is 18406416907. The reversal of 18406416859 is 95861460481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95861460481 = 23869 ⋅4016149.

It is a cyclic number.

It is not a de Polignac number, because 18406416859 - 2¹ = 18406416857 is a prime.

It is a super-3 number, since 3×18406416859³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18406416857) 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 3 ways as a sum of consecutive naturals, for example, 13922499 + ... + 13923820.

It is an arithmetic number, because the mean of its divisors is an integer number (4608565960).

Almost surely, 2^18406416859 is an apocalyptic number.

18406416859 is a deficient number, since it is larger than the sum of its proper divisors (27846981).

18406416859 is an equidigital number, since it uses as much as digits as its factorization.

18406416859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27846980.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 18406416859 in words is "eighteen billion, four hundred six million, four hundred sixteen thousand, eight hundred fifty-nine".