66394373 has 4 divisors (see below), whose sum is σ = 66572748. Its totient is φ = 66216000.

The previous prime is 66394351. The next prime is 66394397. The reversal of 66394373 is 37349366.

66394373 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37349366 = 2 ⋅18674683.

It can be written as a sum of positive squares in 2 ways, for example, as 48135844 + 18258529 = 6938^2 + 4273^2 .

It is a cyclic number.

It is not a de Polignac number, because 66394373 - 2⁶ = 66394309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66394373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66394073) 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 3 ways as a sum of consecutive naturals, for example, 88628 + ... + 89373.

It is an arithmetic number, because the mean of its divisors is an integer number (16643187).

Almost surely, 2^66394373 is an apocalyptic number.

It is an amenable number.

66394373 is a deficient number, since it is larger than the sum of its proper divisors (178375).

66394373 is a wasteful number, since it uses less digits than its factorization.

66394373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178374.

The product of its digits is 244944, while the sum is 41.

The square root of 66394373 is about 8148.2742344622. The cubic root of 66394373 is about 404.9273313708.

The spelling of 66394373 in words is "sixty-six million, three hundred ninety-four thousand, three hundred seventy-three".