66651323 has 2 divisors, whose sum is σ = 66651324. Its totient is φ = 66651322.

The previous prime is 66651317. The next prime is 66651331. The reversal of 66651323 is 32315666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66651323 - 2¹⁸ = 66389179 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66651323.

It is not a weakly prime, because it can be changed into another prime (66651383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33325661 + 33325662.

It is an arithmetic number, because the mean of its divisors is an integer number (33325662).

Almost surely, 2^66651323 is an apocalyptic number.

66651323 is a deficient number, since it is larger than the sum of its proper divisors (1).

66651323 is an equidigital number, since it uses as much as digits as its factorization.

66651323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 32.

The square root of 66651323 is about 8164.0261513545. The cubic root of 66651323 is about 405.4490228914.

Adding to 66651323 its reverse (32315666), we get a palindrome (98966989).

The spelling of 66651323 in words is "sixty-six million, six hundred fifty-one thousand, three hundred twenty-three".