66232321 has 4 divisors (see below), whose sum is σ = 66252544. Its totient is φ = 66212100.

The previous prime is 66232319. The next prime is 66232333. The reversal of 66232321 is 12323266.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66232321 - 2¹ = 66232319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66202321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3945 + ... + 12166.

It is an arithmetic number, because the mean of its divisors is an integer number (16563136).

It is a Proth number, since it is equal to 8085 ⋅ 2¹³ + 1 and 8085 < 2¹³.

Almost surely, 2^66232321 is an apocalyptic number.

It is an amenable number.

66232321 is a deficient number, since it is larger than the sum of its proper divisors (20223).

66232321 is a wasteful number, since it uses less digits than its factorization.

66232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20222.

The product of its digits is 2592, while the sum is 25.

The square root of 66232321 is about 8138.3242132518. The cubic root of 66232321 is about 404.5976209843.

Adding to 66232321 its reverse (12323266), we get a palindrome (78555587).

The spelling of 66232321 in words is "sixty-six million, two hundred thirty-two thousand, three hundred twenty-one".