16718181861 has 16 divisors (see below), whose sum is σ = 23425776704. Its totient is φ = 10592031744.

The previous prime is 16718181839. The next prime is 16718181863. The reversal of 16718181861 is 16818181761.

It is not a de Polignac number, because 16718181861 - 2⁹ = 16718181349 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16718181861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16718181863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1746556 + ... + 1756101.

It is an arithmetic number, because the mean of its divisors is an integer number (1464111044).

Almost surely, 2^16718181861 is an apocalyptic number.

It is an amenable number.

16718181861 is a deficient number, since it is larger than the sum of its proper divisors (6707594843).

16718181861 is a wasteful number, since it uses less digits than its factorization.

16718181861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502740.

The product of its digits is 129024, while the sum is 48.

The spelling of 16718181861 in words is "sixteen billion, seven hundred eighteen million, one hundred eighty-one thousand, eight hundred sixty-one".