555555220128 has 96 divisors (see below), whose sum is σ = 1622302819200. Its totient is φ = 184964110848.

The previous prime is 555555220111. The next prime is 555555220159. The reversal of 555555220128 is 821022555555.

555555220128 is a `hidden beast` number, since 5 + 5 + 55 + 552 + 20 + 1 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×555555220128² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341700 + ... + 1108092.

It is an arithmetic number, because the mean of its divisors is an integer number (16898987700).

Almost surely, 2^555555220128 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 555555220128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (811151409600).

555555220128 is an abundant number, since it is smaller than the sum of its proper divisors (1066747599072).

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

555555220128 is a wasteful number, since it uses less digits than its factorization.

555555220128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767251 (or 767237 counting only the distinct ones).

The product of its (nonzero) digits is 1000000, while the sum is 45.

The spelling of 555555220128 in words is "five hundred fifty-five billion, five hundred fifty-five million, two hundred twenty thousand, one hundred twenty-eight".