66044149 has 4 divisors (see below), whose sum is σ = 67829164. Its totient is φ = 64259136.

The previous prime is 66044131. The next prime is 66044159. The reversal of 66044149 is 94144066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64112049 + 1932100 = 8007^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 66044149 - 2¹⁷ = 65913077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66044119) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 892452 + ... + 892525.

It is an arithmetic number, because the mean of its divisors is an integer number (16957291).

Almost surely, 2^66044149 is an apocalyptic number.

It is an amenable number.

66044149 is a deficient number, since it is larger than the sum of its proper divisors (1785015).

66044149 is a wasteful number, since it uses less digits than its factorization.

66044149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785014.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 66044149 is about 8126.7551335081. The cubic root of 66044149 is about 404.2140914249.

The spelling of 66044149 in words is "sixty-six million, forty-four thousand, one hundred forty-nine".