66786045906 has 8 divisors (see below), whose sum is σ = 133572091824. Its totient is φ = 22262015300.

The previous prime is 66786045901. The next prime is 66786045923. The reversal of 66786045906 is 60954068766.

It is a happy number.

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

66786045906 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (66786045901) 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, 5565503820 + ... + 5565503831.

It is an arithmetic number, because the mean of its divisors is an integer number (16696511478).

Almost surely, 2^66786045906 is an apocalyptic number.

66786045906 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.

66786045906 is a wasteful number, since it uses less digits than its factorization.

66786045906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11131007656.

The product of its (nonzero) digits is 13063680, while the sum is 57.

The spelling of 66786045906 in words is "sixty-six billion, seven hundred eighty-six million, forty-five thousand, nine hundred six".