71667457513 has 2 divisors, whose sum is σ = 71667457514. Its totient is φ = 71667457512.

The previous prime is 71667457409. The next prime is 71667457571. The reversal of 71667457513 is 31575476617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71659006864 + 8450649 = 267692^2 + 2907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71667457513 is a prime.

It is not a weakly prime, because it can be changed into another prime (71667457613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35833728756 + 35833728757.

It is an arithmetic number, because the mean of its divisors is an integer number (35833728757).

Almost surely, 2^71667457513 is an apocalyptic number.

It is an amenable number.

71667457513 is a deficient number, since it is larger than the sum of its proper divisors (1).

71667457513 is an equidigital number, since it uses as much as digits as its factorization.

71667457513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3704400, while the sum is 52.

The spelling of 71667457513 in words is "seventy-one billion, six hundred sixty-seven million, four hundred fifty-seven thousand, five hundred thirteen".