66801793 has 2 divisors, whose sum is σ = 66801794. Its totient is φ = 66801792.

The previous prime is 66801769. The next prime is 66801797. The reversal of 66801793 is 39710866.

66801793 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., 61340224 + 5461569 = 7832^2 + 2337^2 .

It is a cyclic number.

It is not a de Polignac number, because 66801793 - 2²¹ = 64704641 is a prime.

It is not a weakly prime, because it can be changed into another prime (66801797) 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, 33400896 + 33400897.

It is an arithmetic number, because the mean of its divisors is an integer number (33400897).

Almost surely, 2^66801793 is an apocalyptic number.

It is an amenable number.

66801793 is a deficient number, since it is larger than the sum of its proper divisors (1).

66801793 is an equidigital number, since it uses as much as digits as its factorization.

66801793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 66801793 is about 8173.2363846887. The cubic root of 66801793 is about 405.7539033716.

The spelling of 66801793 in words is "sixty-six million, eight hundred one thousand, seven hundred ninety-three".