66506223 has 16 divisors (see below), whose sum is σ = 103815936. Its totient is φ = 37076160.

The previous prime is 66506201. The next prime is 66506243. The reversal of 66506223 is 32260566.

It is not a de Polignac number, because 66506223 - 2⁹ = 66505711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66506243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37761 + ... + 39482.

It is an arithmetic number, because the mean of its divisors is an integer number (6488496).

Almost surely, 2^66506223 is an apocalyptic number.

66506223 is a deficient number, since it is larger than the sum of its proper divisors (37309713).

66506223 is a wasteful number, since it uses less digits than its factorization.

66506223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77294.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 66506223 is about 8155.1347628350. The cubic root of 66506223 is about 405.1545881438.

Adding to 66506223 its reverse (32260566), we get a palindrome (98766789).

The spelling of 66506223 in words is "sixty-six million, five hundred six thousand, two hundred twenty-three".