18406368508 has 36 divisors (see below), whose sum is σ = 35832290760. Its totient is φ = 8265711520.

The previous prime is 18406368419. The next prime is 18406368529. The reversal of 18406368508 is 80586360481.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 188923 + ... + 269266.

It is an arithmetic number, because the mean of its divisors is an integer number (995341410).

Almost surely, 2^18406368508 is an apocalyptic number.

It is an amenable number.

18406368508 is a deficient number, since it is larger than the sum of its proper divisors (17425922252).

18406368508 is a wasteful number, since it uses less digits than its factorization.

18406368508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458298 (or 458285 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 18406368508 in words is "eighteen billion, four hundred six million, three hundred sixty-eight thousand, five hundred eight".