66660103 has 2 divisors, whose sum is σ = 66660104. Its totient is φ = 66660102.

The previous prime is 66660071. The next prime is 66660107. The reversal of 66660103 is 30106666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66660103 - 2⁵ = 66660071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66660107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33330051 + 33330052.

It is an arithmetic number, because the mean of its divisors is an integer number (33330052).

Almost surely, 2^66660103 is an apocalyptic number.

66660103 is a deficient number, since it is larger than the sum of its proper divisors (1).

66660103 is an equidigital number, since it uses as much as digits as its factorization.

66660103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 66660103 is about 8164.5638585291. The cubic root of 66660103 is about 405.4668254193.

Adding to 66660103 its reverse (30106666), we get a palindrome (96766769).

The spelling of 66660103 in words is "sixty-six million, six hundred sixty thousand, one hundred three".