65442221 has 8 divisors (see below), whose sum is σ = 70872480. Its totient is φ = 60068592.

The previous prime is 65442187. The next prime is 65442239. The reversal of 65442221 is 12224456.

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 65442221 - 2¹⁸ = 65180077 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65442721) 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, 11735 + ... + 16388.

It is an arithmetic number, because the mean of its divisors is an integer number (8859060).

Almost surely, 2^65442221 is an apocalyptic number.

It is an amenable number.

65442221 is a deficient number, since it is larger than the sum of its proper divisors (5430259).

65442221 is a wasteful number, since it uses less digits than its factorization.

65442221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28315.

The product of its digits is 3840, while the sum is 26.

The square root of 65442221 is about 8089.6366420254. The cubic root of 65442221 is about 402.9823360010.

Adding to 65442221 its reverse (12224456), we get a palindrome (77666677).

It can be divided in two parts, 654 and 42221, that added together give a cube (42875 = 35³).

The spelling of 65442221 in words is "sixty-five million, four hundred forty-two thousand, two hundred twenty-one".