55651680 is a `hidden beast` number, since 5 + 565 + 16 + 80 = 666.
It is a tau number, because it is divible by the number of its divisors (144).
It is a congruent number.
It is an unprimeable number.
Almost surely, 255651680 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 55651680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108540432).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
55651680 is a wasteful number, since it uses less digits than its factorization.
55651680 is an odious number, because the sum of its binary digits is odd.
The square root of 55651680 is about 7460.0053619284. The cubic root of 55651680 is about 381.7913574229.
The spelling of 55651680 in words is "fifty-five million, six hundred fifty-one thousand, six hundred eighty".