664652241 has 24 divisors (see below), whose sum is σ = 1050304320. Its totient is φ = 401676000.

The previous prime is 664652203. The next prime is 664652251. The reversal of 664652241 is 142256466.

664652241 is a `hidden beast` number, since 6 + 646 + 5 + 2 + 2 + 4 + 1 = 666.

It is not a de Polignac number, because 664652241 - 2⁷ = 664652113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664652196 and 664652205.

It is not an unprimeable number, because it can be changed into a prime (664652251) 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 23 ways as a sum of consecutive naturals, for example, 26191 + ... + 44891.

It is an arithmetic number, because the mean of its divisors is an integer number (43762680).

Almost surely, 2^664652241 is an apocalyptic number.

It is an amenable number.

664652241 is a deficient number, since it is larger than the sum of its proper divisors (385652079).

664652241 is a wasteful number, since it uses less digits than its factorization.

664652241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19077 (or 19074 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 664652241 is about 25780.8502769013. The cubic root of 664652241 is about 872.6996955627.

The spelling of 664652241 in words is "six hundred sixty-four million, six hundred fifty-two thousand, two hundred forty-one".