66242180 has 12 divisors (see below), whose sum is σ = 139108620. Its totient is φ = 26496864.

The previous prime is 66242179. The next prime is 66242201. The reversal of 66242180 is 8124266.

66242180 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 35617024 + 30625156 = 5968^2 + 5534^2 .

It is a super-2 number, since 2×66242180² = 8776052822304800, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1656035 + ... + 1656074.

It is an arithmetic number, because the mean of its divisors is an integer number (11592385).

Almost surely, 2^66242180 is an apocalyptic number.

It is an amenable number.

66242180 is an abundant number, since it is smaller than the sum of its proper divisors (72866440).

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

66242180 is a wasteful number, since it uses less digits than its factorization.

66242180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3312118 (or 3312116 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 66242180 is about 8138.9299050919. The cubic root of 66242180 is about 404.6176954232.

The spelling of 66242180 in words is "sixty-six million, two hundred forty-two thousand, one hundred eighty".