66912806 has 8 divisors (see below), whose sum is σ = 100416360. Its totient is φ = 33440688.

The previous prime is 66912757. The next prime is 66912821. The reversal of 66912806 is 60821966.

66912806 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.

It is a self number, because there is not a number n which added to its sum of digits gives 66912806.

It is a congruent number.

It is an unprimeable number.

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, 1511 + ... + 11666.

It is an arithmetic number, because the mean of its divisors is an integer number (12552045).

Almost surely, 2^66912806 is an apocalyptic number.

66912806 is a deficient number, since it is larger than the sum of its proper divisors (33503554).

66912806 is a wasteful number, since it uses less digits than its factorization.

66912806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15718.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 66912806 is about 8180.0248165883. The cubic root of 66912806 is about 405.9785431970.

The spelling of 66912806 in words is "sixty-six million, nine hundred twelve thousand, eight hundred six".