66209133 has 16 divisors (see below), whose sum is σ = 90118656. Its totient is φ = 43228080.

The previous prime is 66209131. The next prime is 66209141. The reversal of 66209133 is 33190266.

It is a happy number.

It is not a de Polignac number, because 66209133 - 2¹ = 66209131 is a prime.

It is a super-2 number, since 2×66209133² = 8767298585223378, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66209133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66209131) 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, 33766 + ... + 35672.

It is an arithmetic number, because the mean of its divisors is an integer number (5632416).

Almost surely, 2^66209133 is an apocalyptic number.

It is an amenable number.

66209133 is a deficient number, since it is larger than the sum of its proper divisors (23909523).

66209133 is a wasteful number, since it uses less digits than its factorization.

66209133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 66209133 is about 8136.8994709287. The cubic root of 66209133 is about 404.5503987995.

Adding to 66209133 its reverse (33190266), we get a palindrome (99399399).

It can be divided in two parts, 6620 and 9133, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 66209133 in words is "sixty-six million, two hundred nine thousand, one hundred thirty-three".