71719932785681 has 2 divisors, whose sum is σ = 71719932785682. Its totient is φ = 71719932785680.

The previous prime is 71719932785653. The next prime is 71719932785687. The reversal of 71719932785681 is 18658723991717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40358588771281 + 31361344014400 = 6352841^2 + 5600120^2 .

It is an emirp because it is prime and its reverse (18658723991717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71719932785681 - 2⁴⁶ = 1351188608017 is a prime.

It is a super-2 number, since 2×71719932785681² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71719932785599 and 71719932785608.

It is not a weakly prime, because it can be changed into another prime (71719932785687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35859966392840 + 35859966392841.

It is an arithmetic number, because the mean of its divisors is an integer number (35859966392841).

Almost surely, 2^{71719932785681} is an apocalyptic number.

It is an amenable number.

71719932785681 is a deficient number, since it is larger than the sum of its proper divisors (1).

71719932785681 is an equidigital number, since it uses as much as digits as its factorization.

71719932785681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 320060160, while the sum is 74.

The spelling of 71719932785681 in words is "seventy-one trillion, seven hundred nineteen billion, nine hundred thirty-two million, seven hundred eighty-five thousand, six hundred eighty-one".