76666666717 has 2 divisors, whose sum is σ = 76666666718. Its totient is φ = 76666666716.

The previous prime is 76666666673. The next prime is 76666666721. The reversal of 76666666717 is 71766666667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69239501956 + 7427164761 = 263134^2 + 86181^2 .

It is an emirp because it is prime and its reverse (71766666667) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76666666717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76666666757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38333333358 + 38333333359.

It is an arithmetic number, because the mean of its divisors is an integer number (38333333359).

Almost surely, 2^76666666717 is an apocalyptic number.

It is an amenable number.

76666666717 is a deficient number, since it is larger than the sum of its proper divisors (1).

76666666717 is an equidigital number, since it uses as much as digits as its factorization.

76666666717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96018048, while the sum is 64.

The spelling of 76666666717 in words is "seventy-six billion, six hundred sixty-six million, six hundred sixty-six thousand, seven hundred seventeen".