16819918919 has 8 divisors (see below), whose sum is σ = 16870761648. Its totient is φ = 16769140480.

The previous prime is 16819918909. The next prime is 16819918991. The reversal of 16819918919 is 91981991861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16819918919 - 2²⁸ = 16551483463 is a prime.

It is a super-2 number, since 2×16819918919² (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 (16819918909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536279 + ... + 566775.

It is an arithmetic number, because the mean of its divisors is an integer number (2108845206).

Almost surely, 2^16819918919 is an apocalyptic number.

16819918919 is a deficient number, since it is larger than the sum of its proper divisors (50842729).

16819918919 is a wasteful number, since it uses less digits than its factorization.

16819918919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32145.

The product of its digits is 2519424, while the sum is 62.

The spelling of 16819918919 in words is "sixteen billion, eight hundred nineteen million, nine hundred eighteen thousand, nine hundred nineteen".