66889793 has 2 divisors, whose sum is σ = 66889794. Its totient is φ = 66889792.

The previous prime is 66889777. The next prime is 66889799. The reversal of 66889793 is 39798866.

66889793 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54051904 + 12837889 = 7352^2 + 3583^2 .

It is a cyclic number.

It is not a de Polignac number, because 66889793 - 2⁴ = 66889777 is a prime.

It is not a weakly prime, because it can be changed into another prime (66889799) 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 as a sum of consecutive naturals, namely, 33444896 + 33444897.

It is an arithmetic number, because the mean of its divisors is an integer number (33444897).

Almost surely, 2^66889793 is an apocalyptic number.

It is an amenable number.

66889793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66889793 is an equidigital number, since it uses as much as digits as its factorization.

66889793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 56.

The square root of 66889793 is about 8178.6180372970. The cubic root of 66889793 is about 405.9319957768.

The spelling of 66889793 in words is "sixty-six million, eight hundred eighty-nine thousand, seven hundred ninety-three".