66055809 has 8 divisors (see below), whose sum is σ = 88115040. Its totient is φ = 44016896.

The previous prime is 66055807. The next prime is 66055811. The reversal of 66055809 is 90855066.

It is an interprime number because it is at equal distance from previous prime (66055807) and next prime (66055811).

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 66055809 - 2¹ = 66055807 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66055807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5902 + ... + 12920.

It is an arithmetic number, because the mean of its divisors is an integer number (11014380).

Almost surely, 2^66055809 is an apocalyptic number.

It is an amenable number.

66055809 is a deficient number, since it is larger than the sum of its proper divisors (22059231).

66055809 is a wasteful number, since it uses less digits than its factorization.

66055809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10159.

The product of its (nonzero) digits is 64800, while the sum is 39.

The square root of 66055809 is about 8127.4724853425. The cubic root of 66055809 is about 404.2378778316.

The spelling of 66055809 in words is "sixty-six million, fifty-five thousand, eight hundred nine".