65555666 has 32 divisors (see below), whose sum is σ = 109601856. Its totient is φ = 29160000.

The previous prime is 65555657. The next prime is 65555671. The reversal of 65555666 is 66655556.

65555666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 362096 + ... + 362276.

It is an arithmetic number, because the mean of its divisors is an integer number (3425058).

Almost surely, 2^65555666 is an apocalyptic number.

65555666 is a deficient number, since it is larger than the sum of its proper divisors (44046190).

65555666 is a wasteful number, since it uses less digits than its factorization.

65555666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458.

The product of its digits is 810000, while the sum is 44.

The square root of 65555666 is about 8096.6453547133. The cubic root of 65555666 is about 403.2150600701.

It can be divided in two parts, 6555 and 5666, that added together give a palindrome (12221).

The spelling of 65555666 in words is "sixty-five million, five hundred fifty-five thousand, six hundred sixty-six".