16917172018 has 4 divisors (see below), whose sum is σ = 25375758030. Its totient is φ = 8458586008.

The previous prime is 16917172007. The next prime is 16917172021. The reversal of 16917172018 is 81027171961.

16917172018 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81027171961 = 17 ⋅4766304233.

It can be written as a sum of positive squares in only one way, i.e., 12961139409 + 3956032609 = 113847^2 + 62897^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4229293003 + ... + 4229293006.

Almost surely, 2^16917172018 is an apocalyptic number.

16917172018 is a deficient number, since it is larger than the sum of its proper divisors (8458586012).

16917172018 is an equidigital number, since it uses as much as digits as its factorization.

16917172018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8458586011.

The product of its (nonzero) digits is 42336, while the sum is 43.

The spelling of 16917172018 in words is "sixteen billion, nine hundred seventeen million, one hundred seventy-two thousand, eighteen".