66855210 has 16 divisors (see below), whose sum is σ = 160452576. Its totient is φ = 17828048.

The previous prime is 66855199. The next prime is 66855293. The reversal of 66855210 is 1255866.

66855210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 1114224 + ... + 1114283.

It is an arithmetic number, because the mean of its divisors is an integer number (10028286).

Almost surely, 2^66855210 is an apocalyptic number.

66855210 is an abundant number, since it is smaller than the sum of its proper divisors (93597366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66855210 is a wasteful number, since it uses less digits than its factorization.

66855210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228517.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 66855210 is about 8176.5035314614. The cubic root of 66855210 is about 405.8620261266.

The spelling of 66855210 in words is "sixty-six million, eight hundred fifty-five thousand, two hundred ten".