66055785 has 8 divisors (see below), whose sum is σ = 105689280. Its totient is φ = 35229744.

The previous prime is 66055763. The next prime is 66055789. The reversal of 66055785 is 58755066.

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

It is not a de Polignac number, because 66055785 - 2⁵ = 66055753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66055789) 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 7 ways as a sum of consecutive naturals, for example, 2201845 + ... + 2201874.

It is an arithmetic number, because the mean of its divisors is an integer number (13211160).

Almost surely, 2^66055785 is an apocalyptic number.

It is an amenable number.

66055785 is a deficient number, since it is larger than the sum of its proper divisors (39633495).

66055785 is a wasteful number, since it uses less digits than its factorization.

66055785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4403727.

The product of its (nonzero) digits is 252000, while the sum is 42.

The square root of 66055785 is about 8127.4710088686. The cubic root of 66055785 is about 404.2378288744.

The spelling of 66055785 in words is "sixty-six million, fifty-five thousand, seven hundred eighty-five".