66335623 has 2 divisors, whose sum is σ = 66335624. Its totient is φ = 66335622.

The previous prime is 66335603. The next prime is 66335653. The reversal of 66335623 is 32653366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66335623 - 2¹³ = 66327431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66335603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33167811 + 33167812.

It is an arithmetic number, because the mean of its divisors is an integer number (33167812).

Almost surely, 2^66335623 is an apocalyptic number.

66335623 is a deficient number, since it is larger than the sum of its proper divisors (1).

66335623 is an equidigital number, since it uses as much as digits as its factorization.

66335623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 34.

The square root of 66335623 is about 8144.6683787617. The cubic root of 66335623 is about 404.8078609001.

Adding to 66335623 its reverse (32653366), we get a palindrome (98988989).

The spelling of 66335623 in words is "sixty-six million, three hundred thirty-five thousand, six hundred twenty-three".