71657216659 has 4 divisors (see below), whose sum is σ = 81893961904. Its totient is φ = 61420471416.

The previous prime is 71657216651. The next prime is 71657216677. The reversal of 71657216659 is 95661275617.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95661275617 = 79 ⋅1210902223.

It is a cyclic number.

It is not a de Polignac number, because 71657216659 - 2³ = 71657216651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71657216651) 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, 5118372612 + ... + 5118372625.

It is an arithmetic number, because the mean of its divisors is an integer number (20473490476).

Almost surely, 2^71657216659 is an apocalyptic number.

71657216659 is a deficient number, since it is larger than the sum of its proper divisors (10236745245).

71657216659 is a wasteful number, since it uses less digits than its factorization.

71657216659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236745244.

The product of its digits is 4762800, while the sum is 55.

The spelling of 71657216659 in words is "seventy-one billion, six hundred fifty-seven million, two hundred sixteen thousand, six hundred fifty-nine".