645413125 has 40 divisors (see below), whose sum is σ = 953694720. Its totient is φ = 427224000.

The previous prime is 645413113. The next prime is 645413207. The reversal of 645413125 is 521314546.

It is a happy number.

It is not a de Polignac number, because 645413125 - 2⁷ = 645412997 is a prime.

It is a super-3 number, since 3×645413125³ (a number of 27 digits) contains 333 as substring.

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 39 ways as a sum of consecutive naturals, for example, 124332 + ... + 129418.

It is an arithmetic number, because the mean of its divisors is an integer number (23842368).

Almost surely, 2^645413125 is an apocalyptic number.

It is an amenable number.

645413125 is a deficient number, since it is larger than the sum of its proper divisors (308281595).

645413125 is an equidigital number, since it uses as much as digits as its factorization.

645413125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143 (or 5128 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 645413125 is about 25404.9822869452. The cubic root of 645413125 is about 864.1966881348.

The spelling of 645413125 in words is "six hundred forty-five million, four hundred thirteen thousand, one hundred twenty-five".