55125665556 has 96 divisors (see below), whose sum is σ = 143089056768. Its totient is φ = 16403143680.

The previous prime is 55125665537. The next prime is 55125665563. The reversal of 55125665556 is 65556652155.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 55125665499 and 55125665508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9074136 + ... + 9080208.

It is an arithmetic number, because the mean of its divisors is an integer number (1490511008).

Almost surely, 2^55125665556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55125665556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71544528384).

55125665556 is an abundant number, since it is smaller than the sum of its proper divisors (87963391212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55125665556 is a wasteful number, since it uses less digits than its factorization.

55125665556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8001 (or 7999 counting only the distinct ones).

The product of its digits is 6750000, while the sum is 51.

The spelling of 55125665556 in words is "fifty-five billion, one hundred twenty-five million, six hundred sixty-five thousand, five hundred fifty-six".