664550 has 12 divisors (see below), whose sum is σ = 1236156. Its totient is φ = 265800.

The previous prime is 664549. The next prime is 664561. The reversal of 664550 is 55466.

664550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664550.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6596 + ... + 6695.

It is an arithmetic number, because the mean of its divisors is an integer number (103013).

2⁶⁶⁴⁵⁵⁰ is an apocalyptic number.

664550 is a deficient number, since it is larger than the sum of its proper divisors (571606).

664550 is a wasteful number, since it uses less digits than its factorization.

664550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13303 (or 13298 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 664550 is about 815.1993621195. The cubic root of 664550 is about 87.2654945211.

The spelling of 664550 in words is "six hundred sixty-four thousand, five hundred fifty".