18479475217 has 32 divisors (see below), whose sum is σ = 21566096640. Its totient is φ = 15509007360.

The previous prime is 18479475211. The next prime is 18479475253. The reversal of 18479475217 is 71257497481.

It is not a de Polignac number, because 18479475217 - 2³¹ = 16331991569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18479475211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49542643 + ... + 49543015.

It is an arithmetic number, because the mean of its divisors is an integer number (673940520).

Almost surely, 2^18479475217 is an apocalyptic number.

It is an amenable number.

18479475217 is a deficient number, since it is larger than the sum of its proper divisors (3086621423).

18479475217 is a wasteful number, since it uses less digits than its factorization.

18479475217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033.

The product of its digits is 3951360, while the sum is 55.

The spelling of 18479475217 in words is "eighteen billion, four hundred seventy-nine million, four hundred seventy-five thousand, two hundred seventeen".