71681665073197 has 2 divisors, whose sum is σ = 71681665073198. Its totient is φ = 71681665073196.

The previous prime is 71681665073129. The next prime is 71681665073269. The reversal of 71681665073197 is 79137056618617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58443899709321 + 13237765363876 = 7644861^2 + 3638374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71681665073197 is a prime.

It is a super-2 number, since 2×71681665073197² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71681665073897) 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, 35840832536598 + 35840832536599.

It is an arithmetic number, because the mean of its divisors is an integer number (35840832536599).

Almost surely, 2^{71681665073197} is an apocalyptic number.

It is an amenable number.

71681665073197 is a deficient number, since it is larger than the sum of its proper divisors (1).

71681665073197 is an equidigital number, since it uses as much as digits as its factorization.

71681665073197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80015040, while the sum is 67.

The spelling of 71681665073197 in words is "seventy-one trillion, six hundred eighty-one billion, six hundred sixty-five million, seventy-three thousand, one hundred ninety-seven".