664535252 has 12 divisors (see below), whose sum is σ = 1164379860. Its totient is φ = 331855296.

The previous prime is 664535243. The next prime is 664535269. The reversal of 664535252 is 252535466.

It can be written as a sum of positive squares in 2 ways, for example, as 509134096 + 155401156 = 22564^2 + 12466^2 .

It is a congruent number.

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, 99443 + ... + 105914.

It is an arithmetic number, because the mean of its divisors is an integer number (97031655).

Almost surely, 2^664535252 is an apocalyptic number.

It is an amenable number.

664535252 is a deficient number, since it is larger than the sum of its proper divisors (499844608).

664535252 is a wasteful number, since it uses less digits than its factorization.

664535252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206170 (or 206168 counting only the distinct ones).

The product of its digits is 216000, while the sum is 38.

The square root of 664535252 is about 25778.5812642977. The cubic root of 664535252 is about 872.6484897094.

The spelling of 664535252 in words is "six hundred sixty-four million, five hundred thirty-five thousand, two hundred fifty-two".