65665655 has 16 divisors (see below), whose sum is σ = 86820768. Its totient is φ = 47280000.

The previous prime is 65665637. The next prime is 65665661. The reversal of 65665655 is 55656656.

It is a de Polignac number, because none of the positive numbers 2^k-65665655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 356 + ... + 11465.

It is an arithmetic number, because the mean of its divisors is an integer number (5426298).

Almost surely, 2^65665655 is an apocalyptic number.

65665655 is a deficient number, since it is larger than the sum of its proper divisors (21155113).

65665655 is a wasteful number, since it uses less digits than its factorization.

65665655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11938.

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

The square root of 65665655 is about 8103.4347655793. The cubic root of 65665655 is about 403.4404382058.

It can be divided in two parts, 6566 and 5655, that added together give a palindrome (12221).

The spelling of 65665655 in words is "sixty-five million, six hundred sixty-five thousand, six hundred fifty-five".