71615651617 has 2 divisors, whose sum is σ = 71615651618. Its totient is φ = 71615651616.

The previous prime is 71615651603. The next prime is 71615651629.

71615651617 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42072573456 + 29543078161 = 205116^2 + 171881^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71615651617 is a prime.

It is not a weakly prime, because it can be changed into another prime (71615631617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35807825808 + 35807825809.

It is an arithmetic number, because the mean of its divisors is an integer number (35807825809).

Almost surely, 2^71615651617 is an apocalyptic number.

It is an amenable number.

71615651617 is a deficient number, since it is larger than the sum of its proper divisors (1).

71615651617 is an equidigital number, since it uses as much as digits as its factorization.

71615651617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264600, while the sum is 46.

The spelling of 71615651617 in words is "seventy-one billion, six hundred fifteen million, six hundred fifty-one thousand, six hundred seventeen".