55163520 has 192 divisors, whose sum is σ = 194842440. Its totient is φ = 14376960.

The previous prime is 55163519. The next prime is 55163527. The reversal of 55163520 is 2536155.

55163520 is a `hidden beast` number, since 5 + 5 + 1 + 635 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 22810176 + 32353344 = 4776^2 + 5688^2 .

It is a tau number, because it is divible by the number of its divisors (192).

It is not an unprimeable number, because it can be changed into a prime (55163527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351282 + ... + 351438.

Almost surely, 2^55163520 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 55163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97421220).

55163520 is an abundant number, since it is smaller than the sum of its proper divisors (139678920).

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

55163520 is a wasteful number, since it uses less digits than its factorization.

55163520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 55163520 is about 7427.2148211830. The cubic root of 55163520 is about 380.6717573012.

Adding to 55163520 its reverse (2536155), we get a palindrome (57699675).

The spelling of 55163520 in words is "fifty-five million, one hundred sixty-three thousand, five hundred twenty".