71791561239523 has 2 divisors, whose sum is σ = 71791561239524. Its totient is φ = 71791561239522.

The previous prime is 71791561239457. The next prime is 71791561239553. The reversal of 71791561239523 is 32593216519717.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71791561239523 - 2⁹ = 71791561239011 is a prime.

It is not a weakly prime, because it can be changed into another prime (71791561239553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35895780619761 + 35895780619762.

It is an arithmetic number, because the mean of its divisors is an integer number (35895780619762).

Almost surely, 2^{71791561239523} is an apocalyptic number.

71791561239523 is a deficient number, since it is larger than the sum of its proper divisors (1).

71791561239523 is an equidigital number, since it uses as much as digits as its factorization.

71791561239523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21432600, while the sum is 61.

The spelling of 71791561239523 in words is "seventy-one trillion, seven hundred ninety-one billion, five hundred sixty-one million, two hundred thirty-nine thousand, five hundred twenty-three".