66423293 has 2 divisors, whose sum is σ = 66423294. Its totient is φ = 66423292.

The previous prime is 66423289. The next prime is 66423317. The reversal of 66423293 is 39232466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66227044 + 196249 = 8138^2 + 443^2 .

It is a cyclic number.

It is not a de Polignac number, because 66423293 - 2² = 66423289 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66423263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33211646 + 33211647.

It is an arithmetic number, because the mean of its divisors is an integer number (33211647).

Almost surely, 2^66423293 is an apocalyptic number.

It is an amenable number.

66423293 is a deficient number, since it is larger than the sum of its proper divisors (1).

66423293 is an equidigital number, since it uses as much as digits as its factorization.

66423293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 35.

The square root of 66423293 is about 8150.0486501615. The cubic root of 66423293 is about 404.9861154616.

The spelling of 66423293 in words is "sixty-six million, four hundred twenty-three thousand, two hundred ninety-three".