66220855 has 16 divisors (see below), whose sum is σ = 80932320. Its totient is φ = 52005888.

The previous prime is 66220849. The next prime is 66220877. The reversal of 66220855 is 55802266.

It is a cyclic number.

It is not a de Polignac number, because 66220855 - 2⁷ = 66220727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66220855.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 152719 + ... + 153151.

It is an arithmetic number, because the mean of its divisors is an integer number (5058270).

Almost surely, 2^66220855 is an apocalyptic number.

66220855 is a deficient number, since it is larger than the sum of its proper divisors (14711465).

66220855 is a wasteful number, since it uses less digits than its factorization.

66220855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 66220855 is about 8137.6197379824. The cubic root of 66220855 is about 404.5742719407.

The spelling of 66220855 in words is "sixty-six million, two hundred twenty thousand, eight hundred fifty-five".