16813768331 has 4 divisors (see below), whose sum is σ = 16814028000. Its totient is φ = 16813508664.

The previous prime is 16813768291. The next prime is 16813768333. The reversal of 16813768331 is 13386731861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13386731861 = 30983 ⋅432067.

It is a cyclic number.

It is not a de Polignac number, because 16813768331 - 2⁶ = 16813768267 is a prime.

It is a super-2 number, since 2×16813768331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16813768333) 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, 55070 + ... + 191468.

It is an arithmetic number, because the mean of its divisors is an integer number (4203507000).

Almost surely, 2^16813768331 is an apocalyptic number.

16813768331 is a deficient number, since it is larger than the sum of its proper divisors (259669).

16813768331 is a wasteful number, since it uses less digits than its factorization.

16813768331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259668.

The product of its digits is 435456, while the sum is 47.

The spelling of 16813768331 in words is "sixteen billion, eight hundred thirteen million, seven hundred sixty-eight thousand, three hundred thirty-one".