665466215 has 4 divisors (see below), whose sum is σ = 798559464. Its totient is φ = 532372968.

The previous prime is 665466209. The next prime is 665466223. The reversal of 665466215 is 512664566.

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

It is a cyclic number.

It is not a de Polignac number, because 665466215 - 2⁸ = 665465959 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 66546617 + ... + 66546626.

It is an arithmetic number, because the mean of its divisors is an integer number (199639866).

Almost surely, 2^665466215 is an apocalyptic number.

665466215 is a deficient number, since it is larger than the sum of its proper divisors (133093249).

665466215 is a wasteful number, since it uses less digits than its factorization.

665466215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133093248.

The product of its digits is 259200, while the sum is 41.

The square root of 665466215 is about 25796.6318537905. The cubic root of 665466215 is about 873.0558041329.

The spelling of 665466215 in words is "six hundred sixty-five million, four hundred sixty-six thousand, two hundred fifteen".