66321023 has 2 divisors, whose sum is σ = 66321024. Its totient is φ = 66321022.

The previous prime is 66321019. The next prime is 66321037. The reversal of 66321023 is 32012366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66321023 - 2² = 66321019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66321023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66321043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33160511 + 33160512.

It is an arithmetic number, because the mean of its divisors is an integer number (33160512).

Almost surely, 2^66321023 is an apocalyptic number.

66321023 is a deficient number, since it is larger than the sum of its proper divisors (1).

66321023 is an equidigital number, since it uses as much as digits as its factorization.

66321023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 66321023 is about 8143.7720375757. The cubic root of 66321023 is about 404.7781602749.

Adding to 66321023 its reverse (32012366), we get a palindrome (98333389).

The spelling of 66321023 in words is "sixty-six million, three hundred twenty-one thousand, twenty-three".