66630025 has 24 divisors (see below), whose sum is σ = 103011264. Its totient is φ = 41534400.

The previous prime is 66630019. The next prime is 66630037. The reversal of 66630025 is 52003666.

It is not a de Polignac number, because 66630025 - 2¹⁹ = 66105737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66629975 and 66630002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15382 + ... + 19231.

It is an arithmetic number, because the mean of its divisors is an integer number (4292136).

Almost surely, 2^66630025 is an apocalyptic number.

It is an amenable number.

66630025 is a deficient number, since it is larger than the sum of its proper divisors (36381239).

66630025 is a wasteful number, since it uses less digits than its factorization.

66630025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34641 (or 34636 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 66630025 is about 8162.7216662091. The cubic root of 66630025 is about 405.4058320846.

The spelling of 66630025 in words is "sixty-six million, six hundred thirty thousand, twenty-five".