66000055 has 36 divisors (see below), whose sum is σ = 90636840. Its totient is φ = 46089120.

The previous prime is 66000049. The next prime is 66000071. The reversal of 66000055 is 55000066.

It is not a de Polignac number, because 66000055 - 2³ = 66000047 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 1118616 + ... + 1118674.

It is an arithmetic number, because the mean of its divisors is an integer number (2517690).

Almost surely, 2^66000055 is an apocalyptic number.

66000055 is a deficient number, since it is larger than the sum of its proper divisors (24636785).

66000055 is a wasteful number, since it uses less digits than its factorization.

66000055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 66000055 is about 8124.0417896513. The cubic root of 66000055 is about 404.1241143189.

Adding to 66000055 its reverse (55000066), we get a palindrome (121000121).

The spelling of 66000055 in words is "sixty-six million, fifty-five", and thus it is an aban number and an uban number.