666215226 has 16 divisors (see below), whose sum is σ = 1480478400. Its totient is φ = 222071724.

The previous prime is 666215219. The next prime is 666215257. The reversal of 666215226 is 622512666.

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 7 ways as a sum of consecutive naturals, for example, 6168606 + ... + 6168713.

It is an arithmetic number, because the mean of its divisors is an integer number (92529900).

Almost surely, 2^666215226 is an apocalyptic number.

666215226 is an abundant number, since it is smaller than the sum of its proper divisors (814263174).

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

666215226 is a wasteful number, since it uses less digits than its factorization.

666215226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12337330 (or 12337324 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 666215226 is about 25811.1453833417. The cubic root of 666215226 is about 873.3832353372.

The spelling of 666215226 in words is "six hundred sixty-six million, two hundred fifteen thousand, two hundred twenty-six".