65947947817 has 8 divisors (see below), whose sum is σ = 69100796160. Its totient is φ = 62818895040.

The previous prime is 65947947757. The next prime is 65947947823. The reversal of 65947947817 is 71874974956.

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 65947947817 - 2¹¹ = 65947945769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65947947617) 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, 5943217 + ... + 5954302.

It is an arithmetic number, because the mean of its divisors is an integer number (8637599520).

Almost surely, 2^65947947817 is an apocalyptic number.

It is an amenable number.

65947947817 is a deficient number, since it is larger than the sum of its proper divisors (3152848343).

65947947817 is a wasteful number, since it uses less digits than its factorization.

65947947817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11897783.

The product of its digits is 106686720, while the sum is 67.

The spelling of 65947947817 in words is "sixty-five billion, nine hundred forty-seven million, nine hundred forty-seven thousand, eight hundred seventeen".