66648851 has 2 divisors, whose sum is σ = 66648852. Its totient is φ = 66648850.

The previous prime is 66648817. The next prime is 66648859. The reversal of 66648851 is 15884666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66648851 - 2⁶ = 66648787 is a prime.

It is not a weakly prime, because it can be changed into another prime (66648859) by changing a digit.

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 as a sum of consecutive naturals, namely, 33324425 + 33324426.

It is an arithmetic number, because the mean of its divisors is an integer number (33324426).

Almost surely, 2^66648851 is an apocalyptic number.

66648851 is a deficient number, since it is larger than the sum of its proper divisors (1).

66648851 is an equidigital number, since it uses as much as digits as its factorization.

66648851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 44.

The square root of 66648851 is about 8163.8747540613. The cubic root of 66648851 is about 405.4440103258. Note that the first 3 decimals are identical.

The spelling of 66648851 in words is "sixty-six million, six hundred forty-eight thousand, eight hundred fifty-one".