66123906 has 8 divisors (see below), whose sum is σ = 132247824. Its totient is φ = 22041300.

The previous prime is 66123901. The next prime is 66123907. The reversal of 66123906 is 60932166.

It is a happy number.

66123906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

66123906 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66123901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5510320 + ... + 5510331.

It is an arithmetic number, because the mean of its divisors is an integer number (16530978).

Almost surely, 2^66123906 is an apocalyptic number.

66123906 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66123906 is a wasteful number, since it uses less digits than its factorization.

66123906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11020656.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 66123906 is about 8131.6607159915. The cubic root of 66123906 is about 404.3767398699.

The spelling of 66123906 in words is "sixty-six million, one hundred twenty-three thousand, nine hundred six".