66211144 has 16 divisors (see below), whose sum is σ = 124682220. Its totient is φ = 32962560.

The previous prime is 66211129. The next prime is 66211163. The reversal of 66211144 is 44111266.

66211144 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 66096900 + 114244 = 8130^2 + 338^2 .

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, 15897 + ... + 19624.

Almost surely, 2^66211144 is an apocalyptic number.

It is an amenable number.

66211144 is a deficient number, since it is larger than the sum of its proper divisors (58471076).

66211144 is a wasteful number, since it uses less digits than its factorization.

66211144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35760 (or 35756 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 66211144 is about 8137.0230428579. The cubic root of 66211144 is about 404.5544946223.

The spelling of 66211144 in words is "sixty-six million, two hundred eleven thousand, one hundred forty-four".