16764661717 has 2 divisors, whose sum is σ = 16764661718. Its totient is φ = 16764661716.

The previous prime is 16764661657. The next prime is 16764661733. The reversal of 16764661717 is 71716646761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16710991441 + 53670276 = 129271^2 + 7326^2 .

It is a cyclic number.

It is not a de Polignac number, because 16764661717 - 2²⁷ = 16630443989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16764661747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8382330858 + 8382330859.

It is an arithmetic number, because the mean of its divisors is an integer number (8382330859).

Almost surely, 2^16764661717 is an apocalyptic number.

It is an amenable number.

16764661717 is a deficient number, since it is larger than the sum of its proper divisors (1).

16764661717 is an equidigital number, since it uses as much as digits as its factorization.

16764661717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 52.

The spelling of 16764661717 in words is "sixteen billion, seven hundred sixty-four million, six hundred sixty-one thousand, seven hundred seventeen".