16813780519 has 4 divisors (see below), whose sum is σ = 16814405296. Its totient is φ = 16813155744.

The previous prime is 16813780513. The next prime is 16813780531. The reversal of 16813780519 is 91508731861.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91508731861 = 1913 ⋅47835197.

It is a cyclic number.

It is not a de Polignac number, because 16813780519 - 2⁷ = 16813780391 is a prime.

It is a super-2 number, since 2×16813780519² (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 (16813780513) 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, 270114 + ... + 326479.

It is an arithmetic number, because the mean of its divisors is an integer number (4203601324).

Almost surely, 2^16813780519 is an apocalyptic number.

16813780519 is a deficient number, since it is larger than the sum of its proper divisors (624777).

16813780519 is an equidigital number, since it uses as much as digits as its factorization.

16813780519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624776.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 16813780519 in words is "sixteen billion, eight hundred thirteen million, seven hundred eighty thousand, five hundred nineteen".