66891103 has 4 divisors (see below), whose sum is σ = 67580800. Its totient is φ = 66201408.

The previous prime is 66891091. The next prime is 66891113. The reversal of 66891103 is 30119866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66891103 - 2¹³ = 66882911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66891113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344703 + ... + 344896.

It is an arithmetic number, because the mean of its divisors is an integer number (16895200).

Almost surely, 2^66891103 is an apocalyptic number.

66891103 is a deficient number, since it is larger than the sum of its proper divisors (689697).

66891103 is an equidigital number, since it uses as much as digits as its factorization.

66891103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689696.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 66891103 is about 8178.6981237847. The cubic root of 66891103 is about 405.9346457448.

The spelling of 66891103 in words is "sixty-six million, eight hundred ninety-one thousand, one hundred three".