66266109 has 24 divisors (see below), whose sum is σ = 117807872. Its totient is φ = 34953120.

The previous prime is 66266071. The next prime is 66266117. The reversal of 66266109 is 90166266.

It is a happy number.

It is not a de Polignac number, because 66266109 - 2⁷ = 66265981 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66266159) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39637 + ... + 41274.

Almost surely, 2^66266109 is an apocalyptic number.

It is an amenable number.

66266109 is a deficient number, since it is larger than the sum of its proper divisors (51541763).

66266109 is a wasteful number, since it uses less digits than its factorization.

66266109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80937 (or 80934 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 66266109 is about 8140.3998059063. The cubic root of 66266109 is about 404.6664102614. Note that the first 3 decimals are identical.

The spelling of 66266109 in words is "sixty-six million, two hundred sixty-six thousand, one hundred nine".