666409214 has 16 divisors (see below), whose sum is σ = 1068130800. Its totient is φ = 310725504.

The previous prime is 666409157. The next prime is 666409217. The reversal of 666409214 is 412904666.

It is a happy number.

666409214 is a modest number, since divided by 9214 gives 6664 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666409217) 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, 86204 + ... + 93615.

It is an arithmetic number, because the mean of its divisors is an integer number (66758175).

Almost surely, 2^666409214 is an apocalyptic number.

666409214 is a deficient number, since it is larger than the sum of its proper divisors (401721586).

666409214 is a wasteful number, since it uses less digits than its factorization.

666409214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179947.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 666409214 is about 25814.9029438423. The cubic root of 666409214 is about 873.4679974475.

The spelling of 666409214 in words is "six hundred sixty-six million, four hundred nine thousand, two hundred fourteen".