55136255220 has 144 divisors (see below), whose sum is σ = 177690436560. Its totient is φ = 13812277248.

The previous prime is 55136255189. The next prime is 55136255221. The reversal of 55136255220 is 2255263155.

55136255220 is a `hidden beast` number, since 5 + 5 + 1 + 3 + 625 + 5 + 2 + 20 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 8205098724 + 46931156496 = 90582^2 + 216636^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55136255221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50404 + ... + 335876.

It is an arithmetic number, because the mean of its divisors is an integer number (1233961365).

Almost surely, 2^55136255220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55136255220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88845218280).

55136255220 is an abundant number, since it is smaller than the sum of its proper divisors (122554181340).

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

55136255220 is a wasteful number, since it uses less digits than its factorization.

55136255220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285554 (or 285549 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

It can be divided in two parts, 5513625 and 5220, that multiplied together give a square (28781122500 = 169650²).

The spelling of 55136255220 in words is "fifty-five billion, one hundred thirty-six million, two hundred fifty-five thousand, two hundred twenty".