16681683331 has 2 divisors, whose sum is σ = 16681683332. Its totient is φ = 16681683330.

The previous prime is 16681683329. The next prime is 16681683341. The reversal of 16681683331 is 13338618661.

It is a weak prime.

It is an emirp because it is prime and its reverse (13338618661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16681683331 - 2¹ = 16681683329 is a prime.

It is a super-2 number, since 2×16681683331² (a number of 21 digits) contains 22 as substring.

Together with 16681683329, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16681683341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8340841665 + 8340841666.

It is an arithmetic number, because the mean of its divisors is an integer number (8340841666).

Almost surely, 2^16681683331 is an apocalyptic number.

16681683331 is a deficient number, since it is larger than the sum of its proper divisors (1).

16681683331 is an equidigital number, since it uses as much as digits as its factorization.

16681683331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 46.

The spelling of 16681683331 in words is "sixteen billion, six hundred eighty-one million, six hundred eighty-three thousand, three hundred thirty-one".