66653123 has 2 divisors, whose sum is σ = 66653124. Its totient is φ = 66653122.

The previous prime is 66653117. The next prime is 66653143. The reversal of 66653123 is 32135666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66653123 - 2⁸ = 66652867 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66653123.

It is not a weakly prime, because it can be changed into another prime (66653113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33326561 + 33326562.

It is an arithmetic number, because the mean of its divisors is an integer number (33326562).

Almost surely, 2^66653123 is an apocalyptic number.

66653123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66653123 is an equidigital number, since it uses as much as digits as its factorization.

66653123 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 66653123 is about 8164.1363903355. The cubic root of 66653123 is about 405.4526727398.

Adding to 66653123 its reverse (32135666), we get a palindrome (98788789).

The spelling of 66653123 in words is "sixty-six million, six hundred fifty-three thousand, one hundred twenty-three".