65993964817 has 8 divisors (see below), whose sum is σ = 73525191552. Its totient is φ = 58718034000.

The previous prime is 65993964809. The next prime is 65993964823. The reversal of 65993964817 is 71846939956.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65993964817 - 2³ = 65993964809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65993962817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63823434 + ... + 63824467.

It is an arithmetic number, because the mean of its divisors is an integer number (9190648944).

Almost surely, 2^65993964817 is an apocalyptic number.

It is an amenable number.

65993964817 is a deficient number, since it is larger than the sum of its proper divisors (7531226735).

65993964817 is a wasteful number, since it uses less digits than its factorization.

65993964817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127647959.

The product of its digits is 88179840, while the sum is 67.

The spelling of 65993964817 in words is "sixty-five billion, nine hundred ninety-three million, nine hundred sixty-four thousand, eight hundred seventeen".