555999999 has 32 divisors (see below), whose sum is σ = 803727360. Its totient is φ = 340952832.

The previous prime is 555999979. The next prime is 556000001. The reversal of 555999999 is 999999555.

It is not a de Polignac number, because 555999999 - 2⁵ = 555999967 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

555999999 is a modest number, since divided by 99999 gives 5559 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (555999929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225994 + ... + 228440.

It is an arithmetic number, because the mean of its divisors is an integer number (25116480).

Almost surely, 2^555999999 is an apocalyptic number.

555999999 is a deficient number, since it is larger than the sum of its proper divisors (247727361).

555999999 is a wasteful number, since it uses less digits than its factorization.

555999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599.

The product of its digits is 66430125, while the sum is 69.

The square root of 555999999 is about 23579.6522238985. The cubic root of 555999999 is about 822.2898513692.

The spelling of 555999999 in words is "five hundred fifty-five million, nine hundred ninety-nine thousand, nine hundred ninety-nine".