66009055 has 32 divisors (see below), whose sum is σ = 93063168. Its totient is φ = 44016000.

The previous prime is 66009043. The next prime is 66009061. The reversal of 66009055 is 55090066.

It is a happy number.

It is not a de Polignac number, because 66009055 - 2⁷ = 66008927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 250854 + ... + 251116.

It is an arithmetic number, because the mean of its divisors is an integer number (2908224).

Almost surely, 2^66009055 is an apocalyptic number.

66009055 is a deficient number, since it is larger than the sum of its proper divisors (27054113).

66009055 is a wasteful number, since it uses less digits than its factorization.

66009055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 66009055 is about 8124.5956822478. The cubic root of 66009055 is about 404.1424827466.

The spelling of 66009055 in words is "sixty-six million, nine thousand, fifty-five".