16513447811 has 24 divisors (see below), whose sum is σ = 20723312160. Its totient is φ = 13070383872.

The previous prime is 16513447801. The next prime is 16513447817. The reversal of 16513447811 is 11874431561.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-16513447811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16513447817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142871 + ... + 231168.

It is an arithmetic number, because the mean of its divisors is an integer number (863471340).

Almost surely, 2^16513447811 is an apocalyptic number.

16513447811 is a deficient number, since it is larger than the sum of its proper divisors (4209864349).

16513447811 is a wasteful number, since it uses less digits than its factorization.

16513447811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374123 (or 374116 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The spelling of 16513447811 in words is "sixteen billion, five hundred thirteen million, four hundred forty-seven thousand, eight hundred eleven".