66519125 has 8 divisors (see below), whose sum is σ = 83016024. Its totient is φ = 53215200.

The previous prime is 66519121. The next prime is 66519143. The reversal of 66519125 is 52191566.

66519125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9878449 + 56640676 = 3143^2 + 7526^2 .

It is not a de Polignac number, because 66519125 - 2² = 66519121 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66519121) 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 7 ways as a sum of consecutive naturals, for example, 265952 + ... + 266201.

It is an arithmetic number, because the mean of its divisors is an integer number (10377003).

Almost surely, 2^66519125 is an apocalyptic number.

It is an amenable number.

66519125 is a deficient number, since it is larger than the sum of its proper divisors (16496899).

66519125 is an equidigital number, since it uses as much as digits as its factorization.

66519125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532168 (or 532158 counting only the distinct ones).

The product of its digits is 16200, while the sum is 35.

The square root of 66519125 is about 8155.9257598387. The cubic root of 66519125 is about 405.1807860256.

The spelling of 66519125 in words is "sixty-six million, five hundred nineteen thousand, one hundred twenty-five".