66238423 has 2 divisors, whose sum is σ = 66238424. Its totient is φ = 66238422.

The previous prime is 66238363. The next prime is 66238429. The reversal of 66238423 is 32483266.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66238423 is a prime.

It is equal to p_3909436 and since 66238423 and 3909436 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66238429) 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 as a sum of consecutive naturals, namely, 33119211 + 33119212.

It is an arithmetic number, because the mean of its divisors is an integer number (33119212).

Almost surely, 2^66238423 is an apocalyptic number.

66238423 is a deficient number, since it is larger than the sum of its proper divisors (1).

66238423 is an equidigital number, since it uses as much as digits as its factorization.

66238423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 34.

The square root of 66238423 is about 8138.6990975217. The cubic root of 66238423 is about 404.6100458288.

The spelling of 66238423 in words is "sixty-six million, two hundred thirty-eight thousand, four hundred twenty-three".