66218910 has 32 divisors (see below), whose sum is σ = 168275232. Its totient is φ = 16619520.

The previous prime is 66218903. The next prime is 66218921. The reversal of 66218910 is 1981266.

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, 64411 + ... + 65430.

It is an arithmetic number, because the mean of its divisors is an integer number (5258601).

Almost surely, 2^66218910 is an apocalyptic number.

66218910 is an abundant number, since it is smaller than the sum of its proper divisors (102056322).

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

66218910 is a wasteful number, since it uses less digits than its factorization.

66218910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129868.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 66218910 is about 8137.5002304147. The cubic root of 66218910 is about 404.5703109294.

The spelling of 66218910 in words is "sixty-six million, two hundred eighteen thousand, nine hundred ten".