18420173485 has 16 divisors (see below), whose sum is σ = 26591529600. Its totient is φ = 11966187456.

The previous prime is 18420173467. The next prime is 18420173549. The reversal of 18420173485 is 58437102481.

It is a cyclic number.

It is not a de Polignac number, because 18420173485 - 2²³ = 18411784877 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13849090 + ... + 13850419.

It is an arithmetic number, because the mean of its divisors is an integer number (1661970600).

Almost surely, 2^18420173485 is an apocalyptic number.

It is an amenable number.

18420173485 is a deficient number, since it is larger than the sum of its proper divisors (8171356115).

18420173485 is a wasteful number, since it uses less digits than its factorization.

18420173485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27699540.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 18420173485 in words is "eighteen billion, four hundred twenty million, one hundred seventy-three thousand, four hundred eighty-five".