666215227 has 12 divisors (see below), whose sum is σ = 714612496. Its totient is φ = 620910720.

The previous prime is 666215219. The next prime is 666215257. The reversal of 666215227 is 722512666.

It is not a de Polignac number, because 666215227 - 2³ = 666215219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666215257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18577 + ... + 40957.

Almost surely, 2^666215227 is an apocalyptic number.

666215227 is a deficient number, since it is larger than the sum of its proper divisors (48397269).

666215227 is a wasteful number, since it uses less digits than its factorization.

666215227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22518 (or 22501 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 666215227 is about 25811.1454027131. The cubic root of 666215227 is about 873.3832357742.

The spelling of 666215227 in words is "six hundred sixty-six million, two hundred fifteen thousand, two hundred twenty-seven".