65221663443 has 8 divisors (see below), whose sum is σ = 86977165248. Its totient is φ = 43473635304.

The previous prime is 65221663363. The next prime is 65221663459. The reversal of 65221663443 is 34436612256.

It is a happy number.

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

It is not a de Polignac number, because 65221663443 - 2⁹ = 65221662931 is a prime.

It is a super-2 number, since 2×65221663443² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 65221663395 and 65221663404.

It is not an unprimeable number, because it can be changed into a prime (65221563443) 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, 1848021 + ... + 1882982.

It is an arithmetic number, because the mean of its divisors is an integer number (10872145656).

Almost surely, 2^65221663443 is an apocalyptic number.

65221663443 is a deficient number, since it is larger than the sum of its proper divisors (21755501805).

65221663443 is a wasteful number, since it uses less digits than its factorization.

65221663443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3736833.

The product of its digits is 622080, while the sum is 42.

The spelling of 65221663443 in words is "sixty-five billion, two hundred twenty-one million, six hundred sixty-three thousand, four hundred forty-three".