71681084897 has 2 divisors, whose sum is σ = 71681084898. Its totient is φ = 71681084896.

The previous prime is 71681084873. The next prime is 71681084899. The reversal of 71681084897 is 79848018617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61068788641 + 10612296256 = 247121^2 + 103016^2 .

It is a cyclic number.

It is not a de Polignac number, because 71681084897 - 2⁸ = 71681084641 is a prime.

Together with 71681084899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71681084899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35840542448 + 35840542449.

It is an arithmetic number, because the mean of its divisors is an integer number (35840542449).

Almost surely, 2^71681084897 is an apocalyptic number.

It is an amenable number.

71681084897 is a deficient number, since it is larger than the sum of its proper divisors (1).

71681084897 is an equidigital number, since it uses as much as digits as its factorization.

71681084897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5419008, while the sum is 59.

The spelling of 71681084897 in words is "seventy-one billion, six hundred eighty-one million, eighty-four thousand, eight hundred ninety-seven".