66523423 has 2 divisors, whose sum is σ = 66523424. Its totient is φ = 66523422.

The previous prime is 66523411. The next prime is 66523453. The reversal of 66523423 is 32432566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66523423 - 2¹⁷ = 66392351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66523403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33261711 + 33261712.

It is an arithmetic number, because the mean of its divisors is an integer number (33261712).

Almost surely, 2^66523423 is an apocalyptic number.

66523423 is a deficient number, since it is larger than the sum of its proper divisors (1).

66523423 is an equidigital number, since it uses as much as digits as its factorization.

66523423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 31.

The square root of 66523423 is about 8156.1892449844. The cubic root of 66523423 is about 405.1895124859.

Adding to 66523423 its reverse (32432566), we get a palindrome (98955989).

The spelling of 66523423 in words is "sixty-six million, five hundred twenty-three thousand, four hundred twenty-three".