71219156717 has 2 divisors, whose sum is σ = 71219156718. Its totient is φ = 71219156716.

The previous prime is 71219156689. The next prime is 71219156719. The reversal of 71219156717 is 71765191217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68528244841 + 2690911876 = 261779^2 + 51874^2 .

It is a cyclic number.

It is not a de Polignac number, because 71219156717 - 2⁶ = 71219156653 is a prime.

Together with 71219156719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71219156719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35609578358 + 35609578359.

It is an arithmetic number, because the mean of its divisors is an integer number (35609578359).

Almost surely, 2^71219156717 is an apocalyptic number.

It is an amenable number.

71219156717 is a deficient number, since it is larger than the sum of its proper divisors (1).

71219156717 is an equidigital number, since it uses as much as digits as its factorization.

71219156717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185220, while the sum is 47.

The spelling of 71219156717 in words is "seventy-one billion, two hundred nineteen million, one hundred fifty-six thousand, seven hundred seventeen".