664125544 has 64 divisors (see below), whose sum is σ = 1365537600. Its totient is φ = 301708800.

The previous prime is 664125533. The next prime is 664125547. The reversal of 664125544 is 445521466.

It is not an unprimeable number, because it can be changed into a prime (664125547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379279 + ... + 381025.

It is an arithmetic number, because the mean of its divisors is an integer number (21336525).

Almost surely, 2^664125544 is an apocalyptic number.

It is an amenable number.

664125544 is an abundant number, since it is smaller than the sum of its proper divisors (701412056).

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

664125544 is a wasteful number, since it uses less digits than its factorization.

664125544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874 (or 1870 counting only the distinct ones).

The product of its digits is 115200, while the sum is 37.

The square root of 664125544 is about 25770.6333643549. The cubic root of 664125544 is about 872.4691139386.

The spelling of 664125544 in words is "six hundred sixty-four million, one hundred twenty-five thousand, five hundred forty-four".