66105993 has 16 divisors (see below), whose sum is σ = 92030400. Its totient is φ = 42154560.

The previous prime is 66105989. The next prime is 66106031. The reversal of 66105993 is 39950166.

66105993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66105993 - 2² = 66105989 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66105973) 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 in 15 ways as a sum of consecutive naturals, for example, 5998 + ... + 12968.

It is an arithmetic number, because the mean of its divisors is an integer number (5751900).

Almost surely, 2^66105993 is an apocalyptic number.

It is an amenable number.

66105993 is a deficient number, since it is larger than the sum of its proper divisors (25924407).

66105993 is a wasteful number, since it uses less digits than its factorization.

66105993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7112.

The product of its (nonzero) digits is 43740, while the sum is 39.

The square root of 66105993 is about 8130.5592058603. The cubic root of 66105993 is about 404.3402212834.

The spelling of 66105993 in words is "sixty-six million, one hundred five thousand, nine hundred ninety-three".