555555899 has 4 divisors (see below), whose sum is σ = 555603360. Its totient is φ = 555508440.

The previous prime is 555555881. The next prime is 555555943. The reversal of 555555899 is 998555555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 998555555 = 5 ⋅199711111.

It is a cyclic number.

It is not a de Polignac number, because 555555899 - 2⁸ = 555555643 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (555555199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7742 + ... + 34220.

It is an arithmetic number, because the mean of its divisors is an integer number (138900840).

Almost surely, 2^555555899 is an apocalyptic number.

555555899 is a deficient number, since it is larger than the sum of its proper divisors (47461).

555555899 is a wasteful number, since it uses less digits than its factorization.

555555899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47460.

The product of its digits is 10125000, while the sum is 56.

The square root of 555555899 is about 23570.2333251073. The cubic root of 555555899 is about 822.0708608448.

The spelling of 555555899 in words is "five hundred fifty-five million, five hundred fifty-five thousand, eight hundred ninety-nine".