66208123 has 2 divisors, whose sum is σ = 66208124. Its totient is φ = 66208122.

The previous prime is 66208117. The next prime is 66208147. The reversal of 66208123 is 32180266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66208123 - 2²¹ = 64110971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66208091 and 66208100.

It is not a weakly prime, because it can be changed into another prime (66248123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33104061 + 33104062.

It is an arithmetic number, because the mean of its divisors is an integer number (33104062).

Almost surely, 2^66208123 is an apocalyptic number.

66208123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66208123 is an equidigital number, since it uses as much as digits as its factorization.

66208123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66208123 is about 8136.8374077402. The cubic root of 66208123 is about 404.5483416917.

Adding to 66208123 its reverse (32180266), we get a palindrome (98388389).

The spelling of 66208123 in words is "sixty-six million, two hundred eight thousand, one hundred twenty-three".