65642223 has 8 divisors (see below), whose sum is σ = 88389936. Its totient is φ = 43328000.

The previous prime is 65642201. The next prime is 65642231. The reversal of 65642223 is 32224656.

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 65642223 - 2⁵ = 65642191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65642263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108018 + ... + 108623.

It is an arithmetic number, because the mean of its divisors is an integer number (11048742).

Almost surely, 2^65642223 is an apocalyptic number.

65642223 is a deficient number, since it is larger than the sum of its proper divisors (22747713).

65642223 is a wasteful number, since it uses less digits than its factorization.

65642223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216745.

The product of its digits is 17280, while the sum is 30.

The square root of 65642223 is about 8101.9888299108. The cubic root of 65642223 is about 403.3924448724.

Adding to 65642223 its reverse (32224656), we get a palindrome (97866879).

The spelling of 65642223 in words is "sixty-five million, six hundred forty-two thousand, two hundred twenty-three".