43666541226 has 144 divisors (see below), whose sum is σ = 119021482944. Its totient is φ = 11325600000.

The previous prime is 43666541203. The next prime is 43666541239. The reversal of 43666541226 is 62214566634.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 13430101 + ... + 13433351.

It is an arithmetic number, because the mean of its divisors is an integer number (826538076).

Almost surely, 2^43666541226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43666541226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59510741472).

43666541226 is an abundant number, since it is smaller than the sum of its proper divisors (75354941718).

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

43666541226 is a wasteful number, since it uses less digits than its factorization.

43666541226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4169 (or 4155 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 43666541226 in words is "forty-three billion, six hundred sixty-six million, five hundred forty-one thousand, two hundred twenty-six".