66520423 has 2 divisors, whose sum is σ = 66520424. Its totient is φ = 66520422.

The previous prime is 66520417. The next prime is 66520427. The reversal of 66520423 is 32402566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66520423 - 2⁹ = 66519911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66520391 and 66520400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66520427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33260211 + 33260212.

It is an arithmetic number, because the mean of its divisors is an integer number (33260212).

Almost surely, 2^66520423 is an apocalyptic number.

66520423 is a deficient number, since it is larger than the sum of its proper divisors (1).

66520423 is an equidigital number, since it uses as much as digits as its factorization.

66520423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 66520423 is about 8156.0053334951. The cubic root of 66520423 is about 405.1834214643.

Adding to 66520423 its reverse (32402566), we get a palindrome (98922989).

The spelling of 66520423 in words is "sixty-six million, five hundred twenty thousand, four hundred twenty-three".