71743760821 has 2 divisors, whose sum is σ = 71743760822. Its totient is φ = 71743760820.

The previous prime is 71743760813. The next prime is 71743760833. The reversal of 71743760821 is 12806734717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55525738321 + 16218022500 = 235639^2 + 127350^2 .

It is a cyclic number.

It is not a de Polignac number, because 71743760821 - 2³ = 71743760813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71743760861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35871880410 + 35871880411.

It is an arithmetic number, because the mean of its divisors is an integer number (35871880411).

Almost surely, 2^71743760821 is an apocalyptic number.

It is an amenable number.

71743760821 is a deficient number, since it is larger than the sum of its proper divisors (1).

71743760821 is an equidigital number, since it uses as much as digits as its factorization.

71743760821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 71743760821 in words is "seventy-one billion, seven hundred forty-three million, seven hundred sixty thousand, eight hundred twenty-one".