66005025 has 12 divisors (see below), whose sum is σ = 109128432. Its totient is φ = 35202640.

The previous prime is 66005021. The next prime is 66005029. The reversal of 66005025 is 52050066.

66005025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66005021) and next prime (66005029).

It is not a de Polignac number, because 66005025 - 2² = 66005021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66004986 and 66005004.

It is not an unprimeable number, because it can be changed into a prime (66005021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439959 + ... + 440108.

It is an arithmetic number, because the mean of its divisors is an integer number (9094036).

Almost surely, 2^66005025 is an apocalyptic number.

It is an amenable number.

66005025 is a deficient number, since it is larger than the sum of its proper divisors (43123407).

66005025 is a wasteful number, since it uses less digits than its factorization.

66005025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880080 (or 880075 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 66005025 is about 8124.3476661206. The cubic root of 66005025 is about 404.1342579793.

The spelling of 66005025 in words is "sixty-six million, five thousand, twenty-five".