66819325 has 12 divisors (see below), whose sum is σ = 83163700. Its totient is φ = 53256960.

The previous prime is 66819317. The next prime is 66819359. The reversal of 66819325 is 52391866.

It can be written as a sum of positive squares in 6 ways, for example, as 18071001 + 48748324 = 4251^2 + 6982^2 .

It is not a de Polignac number, because 66819325 - 2³ = 66819317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2101 + ... + 11749.

Almost surely, 2^66819325 is an apocalyptic number.

It is an amenable number.

66819325 is a deficient number, since it is larger than the sum of its proper divisors (16344375).

66819325 is a wasteful number, since it uses less digits than its factorization.

66819325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9936 (or 9931 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 66819325 is about 8174.3088392842. The cubic root of 66819325 is about 405.7893967064.

The spelling of 66819325 in words is "sixty-six million, eight hundred nineteen thousand, three hundred twenty-five".