55516861556 has 12 divisors (see below), whose sum is σ = 104627931492. Its totient is φ = 25623166848.

The previous prime is 55516861549. The next prime is 55516861651. The reversal of 55516861556 is 65516861555.

It can be written as a sum of positive squares in 2 ways, for example, as 37052400100 + 18464461456 = 192490^2 + 135884^2 .

It is a super-2 number, since 2×55516861556² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55516861498 and 55516861507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533815925 + ... + 533816028.

It is an arithmetic number, because the mean of its divisors is an integer number (8718994291).

Almost surely, 2^55516861556 is an apocalyptic number.

It is an amenable number.

55516861556 is a deficient number, since it is larger than the sum of its proper divisors (49111069936).

55516861556 is a wasteful number, since it uses less digits than its factorization.

55516861556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067631970 (or 1067631968 counting only the distinct ones).

The product of its digits is 5400000, while the sum is 53.

Subtracting 55516861556 from its reverse (65516861555), we obtain a palindrome (9999999999).

The spelling of 55516861556 in words is "fifty-five billion, five hundred sixteen million, eight hundred sixty-one thousand, five hundred fifty-six".