16879466581 has 4 divisors (see below), whose sum is σ = 16889345100. Its totient is φ = 16869588064.

The previous prime is 16879466567. The next prime is 16879466603. The reversal of 16879466581 is 18566497861.

It is a happy number.

16879466581 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 7897165956 + 8982300625 = 88866^2 + 94775^2 .

It is a cyclic number.

It is not a de Polignac number, because 16879466581 - 2³¹ = 14731982933 is a prime.

It is a super-2 number, since 2×16879466581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16879466521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4936696 + ... + 4940113.

It is an arithmetic number, because the mean of its divisors is an integer number (4222336275).

Almost surely, 2^16879466581 is an apocalyptic number.

It is an amenable number.

16879466581 is a deficient number, since it is larger than the sum of its proper divisors (9878519).

16879466581 is an equidigital number, since it uses as much as digits as its factorization.

16879466581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9878518.

The product of its digits is 17418240, while the sum is 61.

The spelling of 16879466581 in words is "sixteen billion, eight hundred seventy-nine million, four hundred sixty-six thousand, five hundred eighty-one".