66330623 has 4 divisors (see below), whose sum is σ = 66349728. Its totient is φ = 66311520.

The previous prime is 66330619. The next prime is 66330629. The reversal of 66330623 is 32603366.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66330623 - 2² = 66330619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66330629) 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, 2711 + ... + 11832.

It is an arithmetic number, because the mean of its divisors is an integer number (16587432).

Almost surely, 2^66330623 is an apocalyptic number.

66330623 is a deficient number, since it is larger than the sum of its proper divisors (19105).

66330623 is a wasteful number, since it uses less digits than its factorization.

66330623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19104.

The product of its (nonzero) digits is 11664, while the sum is 29.

The square root of 66330623 is about 8144.3614237090. The cubic root of 66330623 is about 404.7976899438.

Adding to 66330623 its reverse (32603366), we get a palindrome (98933989).

The spelling of 66330623 in words is "sixty-six million, three hundred thirty thousand, six hundred twenty-three".