664173012 has 24 divisors (see below), whose sum is σ = 1585778656. Its totient is φ = 216242208.

The previous prime is 664173007. The next prime is 664173019. The reversal of 664173012 is 210371466.

It is a super-2 number, since 2×664173012² = 882251579738304288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664173019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 643063 + ... + 644094.

Almost surely, 2^664173012 is an apocalyptic number.

It is an amenable number.

664173012 is an abundant number, since it is smaller than the sum of its proper divisors (921605644).

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

664173012 is a wasteful number, since it uses less digits than its factorization.

664173012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1287207 (or 1287205 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 664173012 is about 25771.5543186669. The cubic root of 664173012 is about 872.4898998565.

The spelling of 664173012 in words is "six hundred sixty-four million, one hundred seventy-three thousand, twelve".