16718018 has 4 divisors (see below), whose sum is σ = 25077030. Its totient is φ = 8359008.

The previous prime is 16718003. The next prime is 16718029. The reversal of 16718018 is 81081761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81081761 = 3889 ⋅20849.

It can be written as a sum of positive squares in only one way, i.e., 16265089 + 452929 = 4033^2 + 673^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4179503 + ... + 4179506.

Almost surely, 2^16718018 is an apocalyptic number.

16718018 is a deficient number, since it is larger than the sum of its proper divisors (8359012).

16718018 is an equidigital number, since it uses as much as digits as its factorization.

16718018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8359011.

The product of its (nonzero) digits is 2688, while the sum is 32.

The square root of 16718018 is about 4088.7672958974. The cubic root of 16718018 is about 255.6985485685.

Adding to 16718018 its reverse (81081761), we get a palindrome (97799779).

The spelling of 16718018 in words is "sixteen million, seven hundred eighteen thousand, eighteen".