66225855 has 32 divisors (see below), whose sum is σ = 111444480. Its totient is φ = 33517440.

The previous prime is 66225853. The next prime is 66225857. The reversal of 66225855 is 55852266.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66225853) and next prime (66225857).

It is not a de Polignac number, because 66225855 - 2¹ = 66225853 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66225851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47265 + ... + 48645.

It is an arithmetic number, because the mean of its divisors is an integer number (3482640).

Almost surely, 2^66225855 is an apocalyptic number.

66225855 is a deficient number, since it is larger than the sum of its proper divisors (45218625).

66225855 is a wasteful number, since it uses less digits than its factorization.

66225855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551.

The product of its digits is 144000, while the sum is 39.

The square root of 66225855 is about 8137.9269473251. The cubic root of 66225855 is about 404.5844541331.

The spelling of 66225855 in words is "sixty-six million, two hundred twenty-five thousand, eight hundred fifty-five".