664111115 has 4 divisors (see below), whose sum is σ = 796933344. Its totient is φ = 531288888.

The previous prime is 664111093. The next prime is 664111127. The reversal of 664111115 is 511111466.

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 664111115 - 2¹⁰ = 664110091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66411107 + ... + 66411116.

It is an arithmetic number, because the mean of its divisors is an integer number (199233336).

Almost surely, 2^664111115 is an apocalyptic number.

664111115 is a deficient number, since it is larger than the sum of its proper divisors (132822229).

664111115 is a wasteful number, since it uses less digits than its factorization.

664111115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132822228.

The product of its digits is 720, while the sum is 26.

The square root of 664111115 is about 25770.3534124001. The cubic root of 664111115 is about 872.4627953802.

The spelling of 664111115 in words is "six hundred sixty-four million, one hundred eleven thousand, one hundred fifteen".