71687970791 has 2 divisors, whose sum is σ = 71687970792. Its totient is φ = 71687970790.

The previous prime is 71687970749. The next prime is 71687970793. The reversal of 71687970791 is 19707978617.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71687970791 is a prime.

It is a super-2 number, since 2×71687970791² (a number of 23 digits) contains 22 as substring.

Together with 71687970793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71687970793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35843985395 + 35843985396.

It is an arithmetic number, because the mean of its divisors is an integer number (35843985396).

Almost surely, 2^71687970791 is an apocalyptic number.

71687970791 is a deficient number, since it is larger than the sum of its proper divisors (1).

71687970791 is an equidigital number, since it uses as much as digits as its factorization.

71687970791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9335088, while the sum is 62.

The spelling of 71687970791 in words is "seventy-one billion, six hundred eighty-seven million, nine hundred seventy thousand, seven hundred ninety-one".