664247959 has 4 divisors (see below), whose sum is σ = 664355104. Its totient is φ = 664140816.

The previous prime is 664247957. The next prime is 664247963. The reversal of 664247959 is 959742466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959742466 = 2 ⋅479871233.

It is a cyclic number.

It is not a de Polignac number, because 664247959 - 2¹ = 664247957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664247957) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 43662 + ... + 56875.

It is an arithmetic number, because the mean of its divisors is an integer number (166088776).

Almost surely, 2^664247959 is an apocalyptic number.

664247959 is a deficient number, since it is larger than the sum of its proper divisors (107145).

664247959 is a wasteful number, since it uses less digits than its factorization.

664247959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107144.

The product of its digits is 3265920, while the sum is 52.

The square root of 664247959 is about 25773.0083420620. The cubic root of 664247959 is about 872.5227166276.

The spelling of 664247959 in words is "six hundred sixty-four million, two hundred forty-seven thousand, nine hundred fifty-nine".