71646416563 has 4 divisors (see below), whose sum is σ = 71677050120. Its totient is φ = 71615783008.

The previous prime is 71646416557. The next prime is 71646416587. The reversal of 71646416563 is 36561464617.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71646416563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71646416533) 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, 15313270 + ... + 15317947.

It is an arithmetic number, because the mean of its divisors is an integer number (17919262530).

Almost surely, 2^71646416563 is an apocalyptic number.

71646416563 is a deficient number, since it is larger than the sum of its proper divisors (30633557).

71646416563 is a wasteful number, since it uses less digits than its factorization.

71646416563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30633556.

The product of its digits is 2177280, while the sum is 49.

The spelling of 71646416563 in words is "seventy-one billion, six hundred forty-six million, four hundred sixteen thousand, five hundred sixty-three".