16489179109 has 4 divisors (see below), whose sum is σ = 17757577516. Its totient is φ = 15220780704.

The previous prime is 16489179043. The next prime is 16489179143. The reversal of 16489179109 is 90197198461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90197198461 = 31091 ⋅2901071.

It can be written as a sum of positive squares in 2 ways, for example, as 9225026209 + 7264152900 = 96047^2 + 85230^2 .

It is a cyclic number.

It is not a de Polignac number, because 16489179109 - 2¹³ = 16489170917 is a prime.

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 16489179109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16489179199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634199184 + ... + 634199209.

It is an arithmetic number, because the mean of its divisors is an integer number (4439394379).

Almost surely, 2^16489179109 is an apocalyptic number.

It is an amenable number.

16489179109 is a deficient number, since it is larger than the sum of its proper divisors (1268398407).

16489179109 is a wasteful number, since it uses less digits than its factorization.

16489179109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268398406.

The product of its (nonzero) digits is 979776, while the sum is 55.

The spelling of 16489179109 in words is "sixteen billion, four hundred eighty-nine million, one hundred seventy-nine thousand, one hundred nine".