55189881556 has 72 divisors (see below), whose sum is σ = 101958423840. Its totient is φ = 26133953664.

The previous prime is 55189881521. The next prime is 55189881563. The reversal of 55189881556 is 65518898155.

It is a super-2 number, since 2×55189881556² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55189881494 and 55189881503.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 43835655 + ... + 43836913.

It is an arithmetic number, because the mean of its divisors is an integer number (1416089220).

Almost surely, 2^55189881556 is an apocalyptic number.

It is an amenable number.

55189881556 is a deficient number, since it is larger than the sum of its proper divisors (46768542284).

55189881556 is a wasteful number, since it uses less digits than its factorization.

55189881556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561 (or 1530 counting only the distinct ones).

The product of its digits is 17280000, while the sum is 61.

The spelling of 55189881556 in words is "fifty-five billion, one hundred eighty-nine million, eight hundred eighty-one thousand, five hundred fifty-six".