18420173486 has 16 divisors (see below), whose sum is σ = 32460725808. Its totient is φ = 7728744000.

The previous prime is 18420173467. The next prime is 18420173549. The reversal of 18420173486 is 68437102481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32202815 + ... + 32203386.

It is an arithmetic number, because the mean of its divisors is an integer number (2028795363).

Almost surely, 2^18420173486 is an apocalyptic number.

18420173486 is a deficient number, since it is larger than the sum of its proper divisors (14040552322).

18420173486 is a wasteful number, since it uses less digits than its factorization.

18420173486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64406227.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 18420173486 in words is "eighteen billion, four hundred twenty million, one hundred seventy-three thousand, four hundred eighty-six".