664942004 has 6 divisors (see below), whose sum is σ = 1163648514. Its totient is φ = 332471000.

The previous prime is 664942001. The next prime is 664942007. The reversal of 664942004 is 400249466.

664942004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (664942001) and next prime (664942007).

It can be written as a sum of positive squares in only one way, i.e., 658025104 + 6916900 = 25652^2 + 2630^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664942001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83117747 + ... + 83117754.

It is an arithmetic number, because the mean of its divisors is an integer number (193941419).

Almost surely, 2^664942004 is an apocalyptic number.

It is an amenable number.

664942004 is a deficient number, since it is larger than the sum of its proper divisors (498706510).

664942004 is a wasteful number, since it uses less digits than its factorization.

664942004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166235505 (or 166235503 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 664942004 is about 25786.4693977287. The cubic root of 664942004 is about 872.8264983863.

The spelling of 664942004 in words is "six hundred sixty-four million, nine hundred forty-two thousand, four".