66642244 has 18 divisors (see below), whose sum is σ = 123889850. Its totient is φ = 31360512.

The previous prime is 66642197. The next prime is 66642259. The reversal of 66642244 is 44224666.

66642244 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 3 ways, for example, as 50239744 + 16402500 = 7088^2 + 4050^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

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 5 ways as a sum of consecutive naturals, for example, 27669 + ... + 29980.

Almost surely, 2^66642244 is an apocalyptic number.

It is an amenable number.

66642244 is a deficient number, since it is larger than the sum of its proper divisors (57247606).

66642244 is a wasteful number, since it uses less digits than its factorization.

66642244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57687 (or 57668 counting only the distinct ones).

The product of its digits is 55296, while the sum is 34.

The square root of 66642244 is about 8163.4700954925. The cubic root of 66642244 is about 405.4306124600.

The spelling of 66642244 in words is "sixty-six million, six hundred forty-two thousand, two hundred forty-four".