664241065 has 4 divisors (see below), whose sum is σ = 797089284. Its totient is φ = 531392848.

The previous prime is 664241033. The next prime is 664241077. The reversal of 664241065 is 560142466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 129891609 + 534349456 = 11397^2 + 23116^2 .

It is a cyclic number.

It is not a de Polignac number, because 664241065 - 2⁵ = 664241033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664241065.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66424102 + ... + 66424111.

It is an arithmetic number, because the mean of its divisors is an integer number (199272321).

Almost surely, 2^664241065 is an apocalyptic number.

It is an amenable number.

664241065 is a deficient number, since it is larger than the sum of its proper divisors (132848219).

664241065 is a wasteful number, since it uses less digits than its factorization.

664241065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132848218.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 664241065 is about 25772.8745971419. The cubic root of 664241065 is about 872.5196980799.

The spelling of 664241065 in words is "six hundred sixty-four million, two hundred forty-one thousand, sixty-five".