18009166838 has 8 divisors (see below), whose sum is σ = 29091731088. Its totient is φ = 8311923144.

The previous prime is 18009166817. The next prime is 18009166871. The reversal of 18009166838 is 83866190081.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346330106 + ... + 346330157.

It is an arithmetic number, because the mean of its divisors is an integer number (3636466386).

Almost surely, 2^18009166838 is an apocalyptic number.

18009166838 is a deficient number, since it is larger than the sum of its proper divisors (11082564250).

18009166838 is a wasteful number, since it uses less digits than its factorization.

18009166838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692660278.

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 18009166838 in words is "eighteen billion, nine million, one hundred sixty-six thousand, eight hundred thirty-eight".