66449223 has 12 divisors (see below), whose sum is σ = 96289128. Its totient is φ = 44157840.

The previous prime is 66449221. The next prime is 66449287. The reversal of 66449223 is 32294466.

66449223 is a `hidden beast` number, since 6 + 644 + 9 + 2 + 2 + 3 = 666.

It is not a de Polignac number, because 66449223 - 2¹ = 66449221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66449221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8793 + ... + 14498.

It is an arithmetic number, because the mean of its divisors is an integer number (8024094).

Almost surely, 2^66449223 is an apocalyptic number.

66449223 is a deficient number, since it is larger than the sum of its proper divisors (29839905).

66449223 is a wasteful number, since it uses less digits than its factorization.

66449223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23614 (or 23611 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 66449223 is about 8151.6392829909. The cubic root of 66449223 is about 405.0388074382.

The spelling of 66449223 in words is "sixty-six million, four hundred forty-nine thousand, two hundred twenty-three".