71931671697643 has 2 divisors, whose sum is σ = 71931671697644. Its totient is φ = 71931671697642.

The previous prime is 71931671697559. The next prime is 71931671697659. The reversal of 71931671697643 is 34679617613917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71931671697643 - 2⁹ = 71931671697131 is a prime.

It is a super-2 number, since 2×71931671697643² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71931671697043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35965835848821 + 35965835848822.

It is an arithmetic number, because the mean of its divisors is an integer number (35965835848822).

Almost surely, 2^{71931671697643} is an apocalyptic number.

71931671697643 is a deficient number, since it is larger than the sum of its proper divisors (1).

71931671697643 is an equidigital number, since it uses as much as digits as its factorization.

71931671697643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216040608, while the sum is 70.

The spelling of 71931671697643 in words is "seventy-one trillion, nine hundred thirty-one billion, six hundred seventy-one million, six hundred ninety-seven thousand, six hundred forty-three".