55805556 has 12 divisors (see below), whose sum is σ = 130212992. Its totient is φ = 18601848.

The previous prime is 55805537. The next prime is 55805557. The reversal of 55805556 is 65550855.

55805556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×55805556² = 6228520160938272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55805557) 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 3 ways as a sum of consecutive naturals, for example, 2325220 + ... + 2325243.

Almost surely, 2^55805556 is an apocalyptic number.

It is an amenable number.

55805556 is an abundant number, since it is smaller than the sum of its proper divisors (74407436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55805556 is a wasteful number, since it uses less digits than its factorization.

55805556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650470 (or 4650468 counting only the distinct ones).

The product of its (nonzero) digits is 150000, while the sum is 39.

The square root of 55805556 is about 7470.3116400857. The cubic root of 55805556 is about 382.1429159244.

The spelling of 55805556 in words is "fifty-five million, eight hundred five thousand, five hundred fifty-six".