55555569 has 12 divisors (see below), whose sum is σ = 80336256. Its totient is φ = 36995832.

The previous prime is 55555559. The next prime is 55555573. The reversal of 55555569 is 96555555.

It is not a de Polignac number, because 55555569 - 2⁴ = 55555553 is a prime.

It is a super-2 number, since 2×55555569² = 6172842493827522, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6664 + ... + 12470.

It is an arithmetic number, because the mean of its divisors is an integer number (6694688).

Almost surely, 2^55555569 is an apocalyptic number.

It is an amenable number.

55555569 is a deficient number, since it is larger than the sum of its proper divisors (24780687).

55555569 is a wasteful number, since it uses less digits than its factorization.

55555569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6876 (or 6873 counting only the distinct ones).

The product of its digits is 843750, while the sum is 45.

The square root of 55555569 is about 7453.5608268800. The cubic root of 55555569 is about 381.5714449645.

The spelling of 55555569 in words is "fifty-five million, five hundred fifty-five thousand, five hundred sixty-nine".