664205516 has 12 divisors (see below), whose sum is σ = 1251772032. Its totient is φ = 306556368.

The previous prime is 664205513. The next prime is 664205519. The reversal of 664205516 is 615502466.

It is an interprime number because it is at equal distance from previous prime (664205513) and next prime (664205519).

It is not an unprimeable number, because it can be changed into a prime (664205513) by changing a digit.

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, 6386540 + ... + 6386643.

It is an arithmetic number, because the mean of its divisors is an integer number (104314336).

Almost surely, 2^664205516 is an apocalyptic number.

It is an amenable number.

664205516 is a deficient number, since it is larger than the sum of its proper divisors (587566516).

664205516 is a wasteful number, since it uses less digits than its factorization.

664205516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12773200 (or 12773198 counting only the distinct ones).

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

The square root of 664205516 is about 25772.1849287172. The cubic root of 664205516 is about 872.5041325683.

The spelling of 664205516 in words is "six hundred sixty-four million, two hundred five thousand, five hundred sixteen".