664165252 has 12 divisors (see below), whose sum is σ = 1162981260. Its totient is φ = 331884896.

The previous prime is 664165247. The next prime is 664165261. The reversal of 664165252 is 252561466.

664165252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 148693636 + 515471616 = 12194^2 + 22704^2 .

It is a super-2 number, since 2×664165252² = 882230963928447008, which contains 22 as substring.

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, 41743 + ... + 55414.

It is an arithmetic number, because the mean of its divisors is an integer number (96915105).

Almost surely, 2^664165252 is an apocalyptic number.

It is an amenable number.

664165252 is a deficient number, since it is larger than the sum of its proper divisors (498816008).

664165252 is a wasteful number, since it uses less digits than its factorization.

664165252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98870 (or 98868 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 664165252 is about 25771.4037646380. The cubic root of 664165252 is about 872.4865018724.

The spelling of 664165252 in words is "six hundred sixty-four million, one hundred sixty-five thousand, two hundred fifty-two".