55656565 has 16 divisors (see below), whose sum is σ = 68485248. Its totient is φ = 43407936.

The previous prime is 55656553. The next prime is 55656569. The reversal of 55656565 is 56565655.

55656565 = T₁₈₃ + T₁₈₄ + ... + T₆₉₇.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55656565 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55656569) by changing a digit.

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, 33699 + ... + 35311.

It is an arithmetic number, because the mean of its divisors is an integer number (4280328).

Almost surely, 2^55656565 is an apocalyptic number.

It is an amenable number.

55656565 is a deficient number, since it is larger than the sum of its proper divisors (12828683).

55656565 is a wasteful number, since it uses less digits than its factorization.

55656565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788.

The product of its digits is 675000, while the sum is 43.

The square root of 55656565 is about 7460.3327673771. The cubic root of 55656565 is about 381.8025280722.

It can be divided in two parts, 556 and 56565, that added together give a square (57121 = 239²).

The spelling of 55656565 in words is "fifty-five million, six hundred fifty-six thousand, five hundred sixty-five".