66500225 has 24 divisors (see below), whose sum is σ = 91125120. Its totient is φ = 47736000.

The previous prime is 66500207. The next prime is 66500263. The reversal of 66500225 is 52200566.

It is a happy number.

It is not a de Polignac number, because 66500225 - 2¹⁴ = 66483841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66500194 and 66500203.

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, 20195 + ... + 23255.

It is an arithmetic number, because the mean of its divisors is an integer number (3796880).

Almost surely, 2^66500225 is an apocalyptic number.

It is an amenable number.

66500225 is a deficient number, since it is larger than the sum of its proper divisors (24624895).

66500225 is a wasteful number, since it uses less digits than its factorization.

66500225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3161 (or 3156 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 66500225 is about 8154.7670107735. The cubic root of 66500225 is about 405.1424078787.

The spelling of 66500225 in words is "sixty-six million, five hundred thousand, two hundred twenty-five".