66690133 has 32 divisors (see below), whose sum is σ = 79626240. Its totient is φ = 55376640.

The previous prime is 66690121. The next prime is 66690161. The reversal of 66690133 is 33109666.

It is a happy number.

It is not a de Polignac number, because 66690133 - 2⁵ = 66690101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66690163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 349068 + ... + 349258.

It is an arithmetic number, because the mean of its divisors is an integer number (2488320).

Almost surely, 2^66690133 is an apocalyptic number.

It is an amenable number.

66690133 is a deficient number, since it is larger than the sum of its proper divisors (12936107).

66690133 is a wasteful number, since it uses less digits than its factorization.

66690133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 66690133 is about 8166.4026964141. The cubic root of 66690133 is about 405.5277031170.

Adding to 66690133 its reverse (33109666), we get a palindrome (99799799).

The spelling of 66690133 in words is "sixty-six million, six hundred ninety thousand, one hundred thirty-three".