644160525 has 48 divisors (see below), whose sum is σ = 1091448000. Its totient is φ = 335119360.

The previous prime is 644160497. The next prime is 644160571. The reversal of 644160525 is 525061446.

It is not a de Polignac number, because 644160525 - 2¹¹ = 644158477 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 658837 + ... + 659813.

It is an arithmetic number, because the mean of its divisors is an integer number (22738500).

Almost surely, 2^644160525 is an apocalyptic number.

It is an amenable number.

644160525 is a deficient number, since it is larger than the sum of its proper divisors (447287475).

644160525 is a wasteful number, since it uses less digits than its factorization.

644160525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1198 (or 1193 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 644160525 is about 25380.3176694067. The cubic root of 644160525 is about 863.6372563661.

It can be divided in two parts, 6441 and 60525, that added together give a palindrome (66966).

The spelling of 644160525 in words is "six hundred forty-four million, one hundred sixty thousand, five hundred twenty-five".