16761676721 has 2 divisors, whose sum is σ = 16761676722. Its totient is φ = 16761676720.

The previous prime is 16761676699. The next prime is 16761676733. The reversal of 16761676721 is 12767616761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10609000000 + 6152676721 = 103000^2 + 78439^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16761676721 is a prime.

It is a Sophie Germain prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16761676721.

It is not a weakly prime, because it can be changed into another prime (16761676741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8380838360 + 8380838361.

It is an arithmetic number, because the mean of its divisors is an integer number (8380838361).

Almost surely, 2^16761676721 is an apocalyptic number.

It is an amenable number.

16761676721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16761676721 is an equidigital number, since it uses as much as digits as its factorization.

16761676721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 50.

The spelling of 16761676721 in words is "sixteen billion, seven hundred sixty-one million, six hundred seventy-six thousand, seven hundred twenty-one".