55840565 has 16 divisors (see below), whose sum is σ = 74886336. Its totient is φ = 39619200.

The previous prime is 55840513. The next prime is 55840567. The reversal of 55840565 is 56504855.

55840565 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 55840565 - 2¹⁰ = 55839541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55840567) by changing a digit.

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, 10127 + ... + 14636.

It is an arithmetic number, because the mean of its divisors is an integer number (4680396).

Almost surely, 2^55840565 is an apocalyptic number.

55840565 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55840565 is a deficient number, since it is larger than the sum of its proper divisors (19045771).

55840565 is a wasteful number, since it uses less digits than its factorization.

55840565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24820.

The product of its (nonzero) digits is 120000, while the sum is 38.

The square root of 55840565 is about 7472.6544815079. The cubic root of 55840565 is about 382.2228102675. Note that the first 3 decimals are identical.

The spelling of 55840565 in words is "fifty-five million, eight hundred forty thousand, five hundred sixty-five".