66705225 has 24 divisors (see below), whose sum is σ = 110528640. Its totient is φ = 35497920.

The previous prime is 66705209. The next prime is 66705271. The reversal of 66705225 is 52250766.

It is not a de Polignac number, because 66705225 - 2⁴ = 66705209 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53307 + ... + 54543.

It is an arithmetic number, because the mean of its divisors is an integer number (4605360).

Almost surely, 2^66705225 is an apocalyptic number.

It is an amenable number.

66705225 is a deficient number, since it is larger than the sum of its proper divisors (43823415).

66705225 is a wasteful number, since it uses less digits than its factorization.

66705225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1969 (or 1964 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 66705225 is about 8167.3266740103. The cubic root of 66705225 is about 405.5582911626.

The spelling of 66705225 in words is "sixty-six million, seven hundred five thousand, two hundred twenty-five".