65664695787471 has 24 divisors (see below), whose sum is σ = 103478393416320. Its totient is φ = 39794188568400.

The previous prime is 65664695787443. The next prime is 65664695787491. The reversal of 65664695787471 is 17478759646656.

65664695787471 is a `hidden beast` number, since 6 + 5 + 6 + 6 + 4 + 69 + 5 + 7 + 87 + 471 = 666.

It is not a de Polignac number, because 65664695787471 - 2³⁰ = 65663622045647 is a prime.

It is a super-3 number, since 3×65664695787471³ (a number of 42 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65664695787401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20114211 + ... + 23149748.

It is an arithmetic number, because the mean of its divisors is an integer number (4311599725680).

Almost surely, 2^{65664695787471} is an apocalyptic number.

65664695787471 is a deficient number, since it is larger than the sum of its proper divisors (37813697628849).

65664695787471 is a wasteful number, since it uses less digits than its factorization.

65664695787471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43279307 (or 43279304 counting only the distinct ones).

The product of its digits is 12802406400, while the sum is 81.

The spelling of 65664695787471 in words is "sixty-five trillion, six hundred sixty-four billion, six hundred ninety-five million, seven hundred eighty-seven thousand, four hundred seventy-one".