55161800 has 48 divisors (see below), whose sum is σ = 129835440. Its totient is φ = 21792320.

The previous prime is 55161791. The next prime is 55161809. The reversal of 55161800 is 816155.

55161800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55161791) and next prime (55161809).

It is a self number, because there is not a number n which added to its sum of digits gives 55161800.

It is not an unprimeable number, because it can be changed into a prime (55161809) 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 11 ways as a sum of consecutive naturals, for example, 14939 + ... + 18261.

It is an arithmetic number, because the mean of its divisors is an integer number (2704905).

Almost surely, 2^55161800 is an apocalyptic number.

55161800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55161800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64917720).

55161800 is an abundant number, since it is smaller than the sum of its proper divisors (74673640).

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

55161800 is a wasteful number, since it uses less digits than its factorization.

55161800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422 (or 3413 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 55161800 is about 7427.0990299039. The cubic root of 55161800 is about 380.6678008083.

Adding to 55161800 its reverse (816155), we get a palindrome (55977955).

The spelling of 55161800 in words is "fifty-five million, one hundred sixty-one thousand, eight hundred".