71611365613 has 2 divisors, whose sum is σ = 71611365614. Its totient is φ = 71611365612.

The previous prime is 71611365569. The next prime is 71611365647. The reversal of 71611365613 is 31656311617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71611365609 + 4 = 267603^2 + 2^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71611365613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71611363613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35805682806 + 35805682807.

It is an arithmetic number, because the mean of its divisors is an integer number (35805682807).

Almost surely, 2^71611365613 is an apocalyptic number.

It is an amenable number.

71611365613 is a deficient number, since it is larger than the sum of its proper divisors (1).

71611365613 is an equidigital number, since it uses as much as digits as its factorization.

71611365613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The spelling of 71611365613 in words is "seventy-one billion, six hundred eleven million, three hundred sixty-five thousand, six hundred thirteen".