66506023 has 16 divisors (see below), whose sum is σ = 74844000. Its totient is φ = 58724352.

The previous prime is 66506021. The next prime is 66506029. The reversal of 66506023 is 32060566.

It is a cyclic number.

It is not a de Polignac number, because 66506023 - 2¹ = 66506021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66505982 and 66506000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66506021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34263 + ... + 36151.

It is an arithmetic number, because the mean of its divisors is an integer number (4677750).

Almost surely, 2^66506023 is an apocalyptic number.

66506023 is a deficient number, since it is larger than the sum of its proper divisors (8337977).

66506023 is a wasteful number, since it uses less digits than its factorization.

66506023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 66506023 is about 8155.1225006127. The cubic root of 66506023 is about 405.1541820114.

Adding to 66506023 its reverse (32060566), we get a palindrome (98566589).

The spelling of 66506023 in words is "sixty-six million, five hundred six thousand, twenty-three".