66413125 has 10 divisors (see below), whose sum is σ = 82990622. Its totient is φ = 53130000.

The previous prime is 66413089. The next prime is 66413131. The reversal of 66413125 is 52131466.

It can be written as a sum of positive squares in 5 ways, for example, as 50936769 + 15476356 = 7137^2 + 3934^2 .

It is not a de Polignac number, because 66413125 - 2⁹ = 66412613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66413093 and 66413102.

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, 52506 + ... + 53755.

Almost surely, 2^66413125 is an apocalyptic number.

It is an amenable number.

66413125 is a deficient number, since it is larger than the sum of its proper divisors (16577497).

66413125 is an equidigital number, since it uses as much as digits as its factorization.

66413125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106281 (or 106266 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 66413125 is about 8149.4248263298. The cubic root of 66413125 is about 404.9654494735.

The spelling of 66413125 in words is "sixty-six million, four hundred thirteen thousand, one hundred twenty-five".