664155752 has 32 divisors (see below), whose sum is σ = 1359470280. Its totient is φ = 302330880.

The previous prime is 664155703. The next prime is 664155757. The reversal of 664155752 is 257551466.

664155752 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 4 ways, for example, as 415588996 + 248566756 = 20386^2 + 15766^2 .

It is a super-2 number, since 2×664155752² = 882205725829371008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664155757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36149 + ... + 51332.

Almost surely, 2^664155752 is an apocalyptic number.

It is an amenable number.

664155752 is an abundant number, since it is smaller than the sum of its proper divisors (695314528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664155752 is a wasteful number, since it uses less digits than its factorization.

664155752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87573 (or 87569 counting only the distinct ones).

The product of its digits is 252000, while the sum is 41.

The square root of 664155752 is about 25771.2194511630. The cubic root of 664155752 is about 872.4823419332.

The spelling of 664155752 in words is "six hundred sixty-four million, one hundred fifty-five thousand, seven hundred fifty-two".