66444246 has 48 divisors (see below), whose sum is σ = 162313200. Its totient is φ = 20132640.

The previous prime is 66444227. The next prime is 66444271. The reversal of 66444246 is 64244466.

It is a happy number.

66444246 is a `hidden beast` number, since 6 + 644 + 4 + 2 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66444246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1450 + ... + 11618.

It is an arithmetic number, because the mean of its divisors is an integer number (3381525).

Almost surely, 2^66444246 is an apocalyptic number.

66444246 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66444246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81156600).

66444246 is an abundant number, since it is smaller than the sum of its proper divisors (95868954).

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

66444246 is a wasteful number, since it uses less digits than its factorization.

66444246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202 (or 10185 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

The square root of 66444246 is about 8151.3340012540. The cubic root of 66444246 is about 405.0286948119.

The spelling of 66444246 in words is "sixty-six million, four hundred forty-four thousand, two hundred forty-six".