66651305 has 16 divisors (see below), whose sum is σ = 96785280. Its totient is φ = 43014912.

The previous prime is 66651283. The next prime is 66651317. The reversal of 66651305 is 50315666.

66651305 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66651305 - 2¹² = 66647209 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 55415 + ... + 56604.

It is an arithmetic number, because the mean of its divisors is an integer number (6049080).

Almost surely, 2^66651305 is an apocalyptic number.

It is an amenable number.

66651305 is a deficient number, since it is larger than the sum of its proper divisors (30133975).

66651305 is a wasteful number, since it uses less digits than its factorization.

66651305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112048.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 66651305 is about 8164.0250489572. The cubic root of 66651305 is about 405.4489863926.

The spelling of 66651305 in words is "sixty-six million, six hundred fifty-one thousand, three hundred five".