71611056709 has 2 divisors, whose sum is σ = 71611056710. Its totient is φ = 71611056708.

The previous prime is 71611056701. The next prime is 71611056827. The reversal of 71611056709 is 90765011617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71514526084 + 96530625 = 267422^2 + 9825^2 .

It is a cyclic number.

It is not a de Polignac number, because 71611056709 - 2³ = 71611056701 is a prime.

It is a super-2 number, since 2×71611056709² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71611056701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35805528354 + 35805528355.

It is an arithmetic number, because the mean of its divisors is an integer number (35805528355).

Almost surely, 2^71611056709 is an apocalyptic number.

It is an amenable number.

71611056709 is a deficient number, since it is larger than the sum of its proper divisors (1).

71611056709 is an equidigital number, since it uses as much as digits as its factorization.

71611056709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 43.

The spelling of 71611056709 in words is "seventy-one billion, six hundred eleven million, fifty-six thousand, seven hundred nine".