71613820709 has 2 divisors, whose sum is σ = 71613820710. Its totient is φ = 71613820708.

The previous prime is 71613820699. The next prime is 71613820787. The reversal of 71613820709 is 90702831617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52159708225 + 19454112484 = 228385^2 + 139478^2 .

It is a cyclic number.

It is not a de Polignac number, because 71613820709 - 2¹² = 71613816613 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71613820709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71613820609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35806910354 + 35806910355.

It is an arithmetic number, because the mean of its divisors is an integer number (35806910355).

Almost surely, 2^71613820709 is an apocalyptic number.

It is an amenable number.

71613820709 is a deficient number, since it is larger than the sum of its proper divisors (1).

71613820709 is an equidigital number, since it uses as much as digits as its factorization.

71613820709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 71613820709 in words is "seventy-one billion, six hundred thirteen million, eight hundred twenty thousand, seven hundred nine".