16766006681 has 2 divisors, whose sum is σ = 16766006682. Its totient is φ = 16766006680.

The previous prime is 16766006671. The next prime is 16766006683. The reversal of 16766006681 is 18660066761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14510611600 + 2255395081 = 120460^2 + 47491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16766006681 is a prime.

It is a super-2 number, since 2×16766006681² (a number of 21 digits) contains 22 as substring.

Together with 16766006683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16766006683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8383003340 + 8383003341.

It is an arithmetic number, because the mean of its divisors is an integer number (8383003341).

Almost surely, 2^16766006681 is an apocalyptic number.

It is an amenable number.

16766006681 is a deficient number, since it is larger than the sum of its proper divisors (1).

16766006681 is an equidigital number, since it uses as much as digits as its factorization.

16766006681 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 16766006681 in words is "sixteen billion, seven hundred sixty-six million, six thousand, six hundred eighty-one".