16574889917 has 4 divisors (see below), whose sum is σ = 16576640316. Its totient is φ = 16573139520.

The previous prime is 16574889911. The next prime is 16574889931. The reversal of 16574889917 is 71998847561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71998847561 = 155539 ⋅462899.

It can be written as a sum of positive squares in 2 ways, for example, as 5584722361 + 10990167556 = 74731^2 + 104834^2 .

It is a cyclic number.

It is not a de Polignac number, because 16574889917 - 2³⁰ = 15501148093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16574889911) 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, 860918 + ... + 879959.

It is an arithmetic number, because the mean of its divisors is an integer number (4144160079).

Almost surely, 2^16574889917 is an apocalyptic number.

It is an amenable number.

16574889917 is a deficient number, since it is larger than the sum of its proper divisors (1750399).

16574889917 is an equidigital number, since it uses as much as digits as its factorization.

16574889917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1750398.

The product of its digits is 30481920, while the sum is 65.

The spelling of 16574889917 in words is "sixteen billion, five hundred seventy-four million, eight hundred eighty-nine thousand, nine hundred seventeen".