71061717613 has 2 divisors, whose sum is σ = 71061717614. Its totient is φ = 71061717612.

The previous prime is 71061717611. The next prime is 71061717641. The reversal of 71061717613 is 31671716017.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64141640644 + 6920076969 = 253262^2 + 83187^2 .

It is a cyclic number.

It is not a de Polignac number, because 71061717613 - 2¹ = 71061717611 is a prime.

Together with 71061717611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71061717611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35530858806 + 35530858807.

It is an arithmetic number, because the mean of its divisors is an integer number (35530858807).

Almost surely, 2^71061717613 is an apocalyptic number.

It is an amenable number.

71061717613 is a deficient number, since it is larger than the sum of its proper divisors (1).

71061717613 is an equidigital number, since it uses as much as digits as its factorization.

71061717613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37044, while the sum is 40.

The spelling of 71061717613 in words is "seventy-one billion, sixty-one million, seven hundred seventeen thousand, six hundred thirteen".