66203425 has 6 divisors (see below), whose sum is σ = 82092278. Its totient is φ = 52962720.

The previous prime is 66203399. The next prime is 66203441. The reversal of 66203425 is 52430266.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 463761 + 65739664 = 681^2 + 8108^2 .

It is not a de Polignac number, because 66203425 - 2⁵ = 66203393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66203393 and 66203402.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1324044 + ... + 1324093.

Almost surely, 2^66203425 is an apocalyptic number.

It is an amenable number.

66203425 is a deficient number, since it is larger than the sum of its proper divisors (15888853).

66203425 is a wasteful number, since it uses less digits than its factorization.

66203425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2648147 (or 2648142 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66203425 is about 8136.5487155181. The cubic root of 66203425 is about 404.5387728101.

The spelling of 66203425 in words is "sixty-six million, two hundred three thousand, four hundred twenty-five".