66106099993 has 2 divisors, whose sum is σ = 66106099994. Its totient is φ = 66106099992.

The previous prime is 66106099991. The next prime is 66106100051. The reversal of 66106099993 is 39999060166.

It is an a-pointer prime, because the next prime (66106100051) can be obtained adding 66106099993 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63477794704 + 2628305289 = 251948^2 + 51267^2 .

It is a cyclic number.

It is not a de Polignac number, because 66106099993 - 2¹ = 66106099991 is a prime.

Together with 66106099991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66106099991) 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, 33053049996 + 33053049997.

It is an arithmetic number, because the mean of its divisors is an integer number (33053049997).

Almost surely, 2^66106099993 is an apocalyptic number.

It is an amenable number.

66106099993 is a deficient number, since it is larger than the sum of its proper divisors (1).

66106099993 is an equidigital number, since it uses as much as digits as its factorization.

66106099993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4251528, while the sum is 58.

The spelling of 66106099993 in words is "sixty-six billion, one hundred six million, ninety-nine thousand, nine hundred ninety-three".