667665214 has 8 divisors (see below), whose sum is σ = 1024788600. Its totient is φ = 326069016.

The previous prime is 667665209. The next prime is 667665239. The reversal of 667665214 is 412566766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3881689 + ... + 3881860.

It is an arithmetic number, because the mean of its divisors is an integer number (128098575).

Almost surely, 2^667665214 is an apocalyptic number.

667665214 is a deficient number, since it is larger than the sum of its proper divisors (357123386).

667665214 is a wasteful number, since it uses less digits than its factorization.

667665214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763594.

The product of its digits is 362880, while the sum is 43.

The square root of 667665214 is about 25839.2185253347. The cubic root of 667665214 is about 874.0164028780.

The spelling of 667665214 in words is "six hundred sixty-seven million, six hundred sixty-five thousand, two hundred fourteen".