64665215 has 8 divisors (see below), whose sum is σ = 80274240. Its totient is φ = 49948192.

The previous prime is 64665203. The next prime is 64665221. The reversal of 64665215 is 51256646.

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

It is a cyclic number.

It is not a de Polignac number, because 64665215 - 2⁴ = 64665199 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222839 + ... + 223128.

It is an arithmetic number, because the mean of its divisors is an integer number (10034280).

Almost surely, 2^64665215 is an apocalyptic number.

64665215 is a deficient number, since it is larger than the sum of its proper divisors (15609025).

64665215 is a wasteful number, since it uses less digits than its factorization.

64665215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446001.

The product of its digits is 43200, while the sum is 35.

The square root of 64665215 is about 8041.4684604244. The cubic root of 64665215 is about 401.3810905673.

The spelling of 64665215 in words is "sixty-four million, six hundred sixty-five thousand, two hundred fifteen".