71320617757 has 2 divisors, whose sum is σ = 71320617758. Its totient is φ = 71320617756.

The previous prime is 71320617751. The next prime is 71320617773. The reversal of 71320617757 is 75771602317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71061697476 + 258920281 = 266574^2 + 16091^2 .

It is a cyclic number.

It is not a de Polignac number, because 71320617757 - 2¹⁵ = 71320584989 is a prime.

It is a super-2 number, since 2×71320617757² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71320617751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35660308878 + 35660308879.

It is an arithmetic number, because the mean of its divisors is an integer number (35660308879).

Almost surely, 2^71320617757 is an apocalyptic number.

It is an amenable number.

71320617757 is a deficient number, since it is larger than the sum of its proper divisors (1).

71320617757 is an equidigital number, since it uses as much as digits as its factorization.

71320617757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432180, while the sum is 46.

The spelling of 71320617757 in words is "seventy-one billion, three hundred twenty million, six hundred seventeen thousand, seven hundred fifty-seven".