18418723173 has 24 divisors (see below), whose sum is σ = 28511877888. Its totient is φ = 11427828192.

The previous prime is 18418723123. The next prime is 18418723181. The reversal of 18418723173 is 37132781481.

It is not a de Polignac number, because 18418723173 - 2¹⁰ = 18418722149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418723123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1194765 + ... + 1210082.

It is an arithmetic number, because the mean of its divisors is an integer number (1187994912).

Almost surely, 2^18418723173 is an apocalyptic number.

It is an amenable number.

18418723173 is a deficient number, since it is larger than the sum of its proper divisors (10093154715).

18418723173 is a wasteful number, since it uses less digits than its factorization.

18418723173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404913 (or 2404910 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The spelling of 18418723173 in words is "eighteen billion, four hundred eighteen million, seven hundred twenty-three thousand, one hundred seventy-three".