66066905 has 8 divisors (see below), whose sum is σ = 79683912. Its totient is φ = 52584448.

The previous prime is 66066899. The next prime is 66066953. The reversal of 66066905 is 50966066.

It can be written as a sum of positive squares in 4 ways, for example, as 41306329 + 24760576 = 6427^2 + 4976^2 .

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 66066905 - 2⁶ = 66066841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32552 + ... + 34521.

It is an arithmetic number, because the mean of its divisors is an integer number (9960489).

Almost surely, 2^66066905 is an apocalyptic number.

It is an amenable number.

66066905 is a deficient number, since it is larger than the sum of its proper divisors (13617007).

66066905 is a wasteful number, since it uses less digits than its factorization.

66066905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67275.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 66066905 is about 8128.1550797214. The cubic root of 66066905 is about 404.2605110788.

The spelling of 66066905 in words is "sixty-six million, sixty-six thousand, nine hundred five".