66788093 has 2 divisors, whose sum is σ = 66788094. Its totient is φ = 66788092.

The previous prime is 66788083. The next prime is 66788171. The reversal of 66788093 is 39088766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56821444 + 9966649 = 7538^2 + 3157^2 .

It is a cyclic number.

It is not a de Polignac number, because 66788093 - 2⁴ = 66788077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66788063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33394046 + 33394047.

It is an arithmetic number, because the mean of its divisors is an integer number (33394047).

Almost surely, 2^66788093 is an apocalyptic number.

It is an amenable number.

66788093 is a deficient number, since it is larger than the sum of its proper divisors (1).

66788093 is an equidigital number, since it uses as much as digits as its factorization.

66788093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 66788093 is about 8172.3982404188. The cubic root of 66788093 is about 405.7261635547.

The spelling of 66788093 in words is "sixty-six million, seven hundred eighty-eight thousand, ninety-three".