65666443633 has 8 divisors (see below), whose sum is σ = 75735872960. Its totient is φ = 55769141520.

The previous prime is 65666443613. The next prime is 65666443649. The reversal of 65666443633 is 33634466656.

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 65666443633 - 2²⁹ = 65129572721 is a prime.

It is a super-5 number, since 5×65666443633⁵ (a number of 55 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65666443613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43030983 + ... + 43032508.

It is an arithmetic number, because the mean of its divisors is an integer number (9466984120).

Almost surely, 2^65666443633 is an apocalyptic number.

It is an amenable number.

65666443633 is a deficient number, since it is larger than the sum of its proper divisors (10069429327).

65666443633 is a wasteful number, since it uses less digits than its factorization.

65666443633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86063607.

The product of its digits is 16796160, while the sum is 52.

The spelling of 65666443633 in words is "sixty-five billion, six hundred sixty-six million, four hundred forty-three thousand, six hundred thirty-three".