66444648 has 32 divisors (see below), whose sum is σ = 166421760. Its totient is φ = 22106880.

The previous prime is 66444647. The next prime is 66444649. The reversal of 66444648 is 84644466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66444647) and next prime (66444649).

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

It is not an unprimeable number, because it can be changed into a prime (66444643) 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 7 ways as a sum of consecutive naturals, for example, 12288 + ... + 16848.

It is an arithmetic number, because the mean of its divisors is an integer number (5200680).

Almost surely, 2^66444648 is an apocalyptic number.

It is an amenable number.

66444648 is an abundant number, since it is smaller than the sum of its proper divisors (99977112).

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

66444648 is a wasteful number, since it uses less digits than its factorization.

66444648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5177 (or 5173 counting only the distinct ones).

The product of its digits is 442368, while the sum is 42.

The square root of 66444648 is about 8151.3586597573. The cubic root of 66444648 is about 405.0295116431.

The spelling of 66444648 in words is "sixty-six million, four hundred forty-four thousand, six hundred forty-eight".