55643565 has 32 divisors (see below), whose sum is σ = 90881280. Its totient is φ = 29067264.

The previous prime is 55643551. The next prime is 55643611. The reversal of 55643565 is 56534655.

55643565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55643565 - 2⁹ = 55643053 is a prime.

It is a Curzon number.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 242871 + ... + 243099.

It is an arithmetic number, because the mean of its divisors is an integer number (2840040).

Almost surely, 2^55643565 is an apocalyptic number.

It is an amenable number.

55643565 is a deficient number, since it is larger than the sum of its proper divisors (35237715).

55643565 is a wasteful number, since it uses less digits than its factorization.

55643565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501.

The product of its digits is 270000, while the sum is 39.

The square root of 55643565 is about 7459.4614416860. The cubic root of 55643565 is about 381.7727992082.

The spelling of 55643565 in words is "fifty-five million, six hundred forty-three thousand, five hundred sixty-five".