66644226 has 24 divisors (see below), whose sum is σ = 157523184. Its totient is φ = 20195160.

The previous prime is 66644213. The next prime is 66644231. The reversal of 66644226 is 62244666.

66644226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11 ways as a sum of consecutive naturals, for example, 168096 + ... + 168491.

It is an arithmetic number, because the mean of its divisors is an integer number (6563466).

Almost surely, 2^66644226 is an apocalyptic number.

66644226 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66644226 is an abundant number, since it is smaller than the sum of its proper divisors (90878958).

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

66644226 is a wasteful number, since it uses less digits than its factorization.

66644226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336606 (or 336603 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 66644226 is about 8163.5914890445. The cubic root of 66644226 is about 405.4346317099.

The spelling of 66644226 in words is "sixty-six million, six hundred forty-four thousand, two hundred twenty-six".