66073993 has 8 divisors (see below), whose sum is σ = 67344480. Its totient is φ = 64812000.

The previous prime is 66073981. The next prime is 66073999. The reversal of 66073993 is 39937066.

It is a happy number.

66073993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66073993 - 2⁵ = 66073961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66073999) 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 7 ways as a sum of consecutive naturals, for example, 14853 + ... + 18781.

It is an arithmetic number, because the mean of its divisors is an integer number (8418060).

Almost surely, 2^66073993 is an apocalyptic number.

It is an amenable number.

66073993 is a deficient number, since it is larger than the sum of its proper divisors (1270487).

66073993 is a wasteful number, since it uses less digits than its factorization.

66073993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247.

The product of its (nonzero) digits is 183708, while the sum is 43.

The square root of 66073993 is about 8128.5910833305. The cubic root of 66073993 is about 404.2749676161.

The spelling of 66073993 in words is "sixty-six million, seventy-three thousand, nine hundred ninety-three".