55511100 has 108 divisors (see below), whose sum is σ = 178806264. Its totient is φ = 14394240.

The previous prime is 55511081. The next prime is 55511123. The reversal of 55511100 is 111555.

55511100 is a `hidden beast` number, since 5 + 551 + 110 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 32467 + ... + 34133.

Almost surely, 2^55511100 is an apocalyptic number.

55511100 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 55511100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89403132).

55511100 is an abundant number, since it is smaller than the sum of its proper divisors (123295164).

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

55511100 is a wasteful number, since it uses less digits than its factorization.

55511100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724 (or 1714 counting only the distinct ones).

The product of its (nonzero) digits is 125, while the sum is 18.

The square root of 55511100 is about 7450.5771588515. The cubic root of 55511100 is about 381.4696092096.

Adding to 55511100 its reverse (111555), we get a palindrome (55622655).

It can be divided in two parts, 55511 and 100, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 55511100 in words is "fifty-five million, five hundred eleven thousand, one hundred".