18195170208 has 24 divisors (see below), whose sum is σ = 47762322048. Its totient is φ = 6065056704.

The previous prime is 18195170183. The next prime is 18195170221. The reversal of 18195170208 is 80207159181.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18195170208.

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, 94766416 + ... + 94766607.

It is an arithmetic number, because the mean of its divisors is an integer number (1990096752).

Almost surely, 2^18195170208 is an apocalyptic number.

It is an amenable number.

18195170208 is an abundant number, since it is smaller than the sum of its proper divisors (29567151840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18195170208 is a wasteful number, since it uses less digits than its factorization.

18195170208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189533036 (or 189533028 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 42.

The spelling of 18195170208 in words is "eighteen billion, one hundred ninety-five million, one hundred seventy thousand, two hundred eight".