71965608503617 has 4 divisors (see below), whose sum is σ = 71965787533956. Its totient is φ = 71965429473280.

The previous prime is 71965608503557. The next prime is 71965608503687. The reversal of 71965608503617 is 71630580656917.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6244121382976 + 65721487120641 = 2498824^2 + 8106879^2 .

It is a cyclic number.

It is not a de Polignac number, because 71965608503617 - 2¹⁹ = 71965607979329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71965608503687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88910848 + ... + 89716609.

It is an arithmetic number, because the mean of its divisors is an integer number (17991446883489).

Almost surely, 2^{71965608503617} is an apocalyptic number.

It is an amenable number.

71965608503617 is a deficient number, since it is larger than the sum of its proper divisors (179030339).

71965608503617 is a wasteful number, since it uses less digits than its factorization.

71965608503617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179030338.

The product of its (nonzero) digits is 57153600, while the sum is 64.

The spelling of 71965608503617 in words is "seventy-one trillion, nine hundred sixty-five billion, six hundred eight million, five hundred three thousand, six hundred seventeen".