16811776399 has 4 divisors (see below), whose sum is σ = 18340119720. Its totient is φ = 15283433080.

The previous prime is 16811776381. The next prime is 16811776433. The reversal of 16811776399 is 99367711861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16811776399 - 2⁵ = 16811776367 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 (16811776339) 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, 764171644 + ... + 764171665.

It is an arithmetic number, because the mean of its divisors is an integer number (4585029930).

Almost surely, 2^16811776399 is an apocalyptic number.

16811776399 is a deficient number, since it is larger than the sum of its proper divisors (1528343321).

16811776399 is a wasteful number, since it uses less digits than its factorization.

16811776399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528343320.

The product of its digits is 3429216, while the sum is 58.

The spelling of 16811776399 in words is "sixteen billion, eight hundred eleven million, seven hundred seventy-six thousand, three hundred ninety-nine".