55557215280 has 480 divisors, whose sum is σ = 224362068480. Its totient is φ = 12598709760.

The previous prime is 55557215261. The next prime is 55557215291. The reversal of 55557215280 is 8251275555.

55557215280 is a `hidden beast` number, since 5 + 5 + 55 + 72 + 1 + 528 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13863037 + ... + 13867043.

It is an arithmetic number, because the mean of its divisors is an integer number (467420976).

Almost surely, 2^55557215280 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 55557215280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112181034240).

55557215280 is an abundant number, since it is smaller than the sum of its proper divisors (168804853200).

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

55557215280 is a wasteful number, since it uses less digits than its factorization.

55557215280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4174 (or 4155 counting only the distinct ones).

The product of its (nonzero) digits is 700000, while the sum is 45.

The spelling of 55557215280 in words is "fifty-five billion, five hundred fifty-seven million, two hundred fifteen thousand, two hundred eighty".