12717787529 has 2 divisors, whose sum is σ = 12717787530. Its totient is φ = 12717787528.

The previous prime is 12717787501. The next prime is 12717787531. The reversal of 12717787529 is 92578771721.

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., 6868597129 + 5849190400 = 82877^2 + 76480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12717787529 is a prime.

Together with 12717787531, 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 (12717787549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6358893764 + 6358893765.

It is an arithmetic number, because the mean of its divisors is an integer number (6358893765).

Almost surely, 2^12717787529 is an apocalyptic number.

It is an amenable number.

12717787529 is a deficient number, since it is larger than the sum of its proper divisors (1).

12717787529 is an equidigital number, since it uses as much as digits as its factorization.

12717787529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3457440, while the sum is 56.

The spelling of 12717787529 in words is "twelve billion, seven hundred seventeen million, seven hundred eighty-seven thousand, five hundred twenty-nine".