666641226 has 16 divisors (see below), whose sum is σ = 1349347104. Its totient is φ = 219536304.

The previous prime is 666641221. The next prime is 666641231. The reversal of 666641226 is 622146666.

666641226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (666641221) and next prime (666641231).

It is not an unprimeable number, because it can be changed into a prime (666641221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 668821 + ... + 669816.

It is an arithmetic number, because the mean of its divisors is an integer number (84334194).

Almost surely, 2^666641226 is an apocalyptic number.

666641226 is an abundant number, since it is smaller than the sum of its proper divisors (682705878).

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

666641226 is a wasteful number, since it uses less digits than its factorization.

666641226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338725.

The product of its digits is 124416, while the sum is 39.

The square root of 666641226 is about 25819.3963136244. The cubic root of 666641226 is about 873.5693523602.

The spelling of 666641226 in words is "six hundred sixty-six million, six hundred forty-one thousand, two hundred twenty-six".