66026393 has 4 divisors (see below), whose sum is σ = 67272228. Its totient is φ = 64780560.

The previous prime is 66026381. The next prime is 66026407. The reversal of 66026393 is 39362066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46063369 + 19963024 = 6787^2 + 4468^2 .

It is a cyclic number.

It is not a de Polignac number, because 66026393 - 2⁴ = 66026377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66026333) 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 in 3 ways as a sum of consecutive naturals, for example, 622838 + ... + 622943.

It is an arithmetic number, because the mean of its divisors is an integer number (16818057).

Almost surely, 2^66026393 is an apocalyptic number.

It is an amenable number.

66026393 is a deficient number, since it is larger than the sum of its proper divisors (1245835).

66026393 is a wasteful number, since it uses less digits than its factorization.

66026393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245834.

The product of its (nonzero) digits is 34992, while the sum is 35.

The square root of 66026393 is about 8125.6626191345. The cubic root of 66026393 is about 404.1778637963.

The spelling of 66026393 in words is "sixty-six million, twenty-six thousand, three hundred ninety-three".