665214806 has 4 divisors (see below), whose sum is σ = 997822212. Its totient is φ = 332607402.

The previous prime is 665214799. The next prime is 665214853. The reversal of 665214806 is 608412566.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 665214806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166303700 + ... + 166303703.

It is an arithmetic number, because the mean of its divisors is an integer number (249455553).

Almost surely, 2^665214806 is an apocalyptic number.

665214806 is a deficient number, since it is larger than the sum of its proper divisors (332607406).

665214806 is a wasteful number, since it uses less digits than its factorization.

665214806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332607405.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 665214806 is about 25791.7584898742. The cubic root of 665214806 is about 872.9458452656.

The spelling of 665214806 in words is "six hundred sixty-five million, two hundred fourteen thousand, eight hundred six".