555555555555556 has 6 divisors (see below), whose sum is σ = 972222222222230. Its totient is φ = 277777777777776.

The previous prime is 555555555555529. The next prime is 555555555555557. The reversal of 555555555555556 is 655555555555555.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 553427224701156 + 2128330854400 = 23525034^2 + 1458880^2 .

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (555555555555557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69444444444441 + ... + 69444444444448.

Almost surely, 2^{555555555555556} is an apocalyptic number.

It is an amenable number.

555555555555556 is a deficient number, since it is larger than the sum of its proper divisors (416666666666674).

555555555555556 is a wasteful number, since it uses less digits than its factorization.

555555555555556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138888888888893 (or 138888888888891 counting only the distinct ones).

The product of its digits is 36621093750, while the sum is 76.

Subtracting 555555555555556 from its reverse (655555555555555), we obtain a palindrome (99999999999999).

The spelling of 555555555555556 in words is "five hundred fifty-five trillion, five hundred fifty-five billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred fifty-six".