66938125 has 10 divisors (see below), whose sum is σ = 83646662. Its totient is φ = 53550000.

The previous prime is 66938111. The next prime is 66938141. The reversal of 66938125 is 52183966.

It can be written as a sum of positive squares in 5 ways, for example, as 46199209 + 20738916 = 6797^2 + 4554^2 .

It is not a de Polignac number, because 66938125 - 2⁵ = 66938093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 52926 + ... + 54175.

Almost surely, 2^66938125 is an apocalyptic number.

It is an amenable number.

66938125 is a deficient number, since it is larger than the sum of its proper divisors (16708537).

66938125 is an equidigital number, since it uses as much as digits as its factorization.

66938125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107121 (or 107106 counting only the distinct ones).

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

The square root of 66938125 is about 8181.5722816583. The cubic root of 66938125 is about 406.0297425370.

The spelling of 66938125 in words is "sixty-six million, nine hundred thirty-eight thousand, one hundred twenty-five".