66605065 has 16 divisors (see below), whose sum is σ = 86600448. Its totient is φ = 48980736.

The previous prime is 66605059. The next prime is 66605117. The reversal of 66605065 is 56050666.

It is a cyclic number.

It is not a de Polignac number, because 66605065 - 2³ = 66605057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66605065.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5457 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (5412528).

Almost surely, 2^66605065 is an apocalyptic number.

It is an amenable number.

66605065 is a deficient number, since it is larger than the sum of its proper divisors (19995383).

66605065 is a wasteful number, since it uses less digits than its factorization.

66605065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18288.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 66605065 is about 8161.1926211798. The cubic root of 66605065 is about 405.3552032909.

The spelling of 66605065 in words is "sixty-six million, six hundred five thousand, sixty-five".