66805423 has 2 divisors, whose sum is σ = 66805424. Its totient is φ = 66805422.

The previous prime is 66805421. The next prime is 66805433. The reversal of 66805423 is 32450866.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66805423 - 2¹ = 66805421 is a prime.

Together with 66805421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66805421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33402711 + 33402712.

It is an arithmetic number, because the mean of its divisors is an integer number (33402712).

Almost surely, 2^66805423 is an apocalyptic number.

66805423 is a deficient number, since it is larger than the sum of its proper divisors (1).

66805423 is an equidigital number, since it uses as much as digits as its factorization.

66805423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 66805423 is about 8173.4584479277. The cubic root of 66805423 is about 405.7612527751.

The spelling of 66805423 in words is "sixty-six million, eight hundred five thousand, four hundred twenty-three".