555005556 has 90 divisors (see below), whose sum is σ = 1636910002. Its totient is φ = 158548320.

The previous prime is 555005533. The next prime is 555005557. The reversal of 555005556 is 655500555.

555005556 is a `hidden beast` number, since 5 + 550 + 0 + 55 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 423536400 + 131469156 = 20580^2 + 11466^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 555005556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555005557) 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 29 ways as a sum of consecutive naturals, for example, 83226 + ... + 89646.

Almost surely, 2^555005556 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 555005556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818455001).

555005556 is an abundant number, since it is smaller than the sum of its proper divisors (1081904446).

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

555005556 is a wasteful number, since it uses less digits than its factorization.

555005556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6459 (or 6433 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 36.

The square root of 555005556 is about 23558.5558980172. Note that the first 3 decimals coincide. The cubic root of 555005556 is about 821.7993187619.

The spelling of 555005556 in words is "five hundred fifty-five million, five thousand, five hundred fifty-six".