66641244 has 12 divisors (see below), whose sum is σ = 155496264. Its totient is φ = 22213744.

The previous prime is 66641221. The next prime is 66641249. The reversal of 66641244 is 44214666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66641249) 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, 2776707 + ... + 2776730.

It is an arithmetic number, because the mean of its divisors is an integer number (12958022).

Almost surely, 2^66641244 is an apocalyptic number.

It is an amenable number.

66641244 is an abundant number, since it is smaller than the sum of its proper divisors (88855020).

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

66641244 is a wasteful number, since it uses less digits than its factorization.

66641244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5553444 (or 5553442 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 66641244 is about 8163.4088467992. The cubic root of 66641244 is about 405.4285845539.

The spelling of 66641244 in words is "sixty-six million, six hundred forty-one thousand, two hundred forty-four".