643737125 has 16 divisors (see below), whose sum is σ = 811200000. Its totient is φ = 509979600.

The previous prime is 643737121. The next prime is 643737167. The reversal of 643737125 is 521737346.

643737125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643737125 - 2² = 643737121 is a prime.

It is a super-2 number, since 2×643737125² = 828794972206531250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643737121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12125 + ... + 37874.

It is an arithmetic number, because the mean of its divisors is an integer number (50700000).

Almost surely, 2^643737125 is an apocalyptic number.

It is an amenable number.

643737125 is a deficient number, since it is larger than the sum of its proper divisors (167462875).

643737125 is a wasteful number, since it uses less digits than its factorization.

643737125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50117 (or 50107 counting only the distinct ones).

The product of its digits is 105840, while the sum is 38.

The square root of 643737125 is about 25371.9751891728. The cubic root of 643737125 is about 863.4479949707.

The spelling of 643737125 in words is "six hundred forty-three million, seven hundred thirty-seven thousand, one hundred twenty-five".