55171809280 has 272 divisors, whose sum is σ = 154013667840. Its totient is φ = 18581815296.

The previous prime is 55171809269. The next prime is 55171809289. The reversal of 55171809280 is 8290817155.

It is a self number, because there is not a number n which added to its sum of digits gives 55171809280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55171809289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153681741 + ... + 153682099.

It is an arithmetic number, because the mean of its divisors is an integer number (566226720).

Almost surely, 2^55171809280 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 55171809280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77006833920).

55171809280 is an abundant number, since it is smaller than the sum of its proper divisors (98841858560).

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

55171809280 is an frugal number, since it uses more digits than its factorization.

55171809280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 46.

The spelling of 55171809280 in words is "fifty-five billion, one hundred seventy-one million, eight hundred nine thousand, two hundred eighty".