66266509 has 8 divisors (see below), whose sum is σ = 70185440. Its totient is φ = 62390736.

The previous prime is 66266507. The next prime is 66266513. The reversal of 66266509 is 90566266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66266509 - 2¹ = 66266507 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 (66266503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7602 + ... + 13795.

It is an arithmetic number, because the mean of its divisors is an integer number (8773180).

Almost surely, 2^66266509 is an apocalyptic number.

It is an amenable number.

66266509 is a deficient number, since it is larger than the sum of its proper divisors (3918931).

66266509 is a wasteful number, since it uses less digits than its factorization.

66266509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21579.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 66266509 is about 8140.4243746871. The cubic root of 66266509 is about 404.6672244847.

The spelling of 66266509 in words is "sixty-six million, two hundred sixty-six thousand, five hundred nine".