55617082721118 has 112 divisors (see below), whose sum is σ = 127660502464560. Its totient is φ = 18159005461248.

The previous prime is 55617082721113. The next prime is 55617082721143. The reversal of 55617082721118 is 81112728071655.

55617082721118 is a `hidden beast` number, since 5 + 5 + 617 + 0 + 8 + 2 + 7 + 2 + 1 + 1 + 18 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55617082721113) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 22661046 + ... + 24995142.

Almost surely, 2^{55617082721118} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55617082721118, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63830251232280).

55617082721118 is an abundant number, since it is smaller than the sum of its proper divisors (72043419743442).

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

55617082721118 is a wasteful number, since it uses less digits than its factorization.

55617082721118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334453 (or 2334438 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 54.

The spelling of 55617082721118 in words is "fifty-five trillion, six hundred seventeen billion, eighty-two million, seven hundred twenty-one thousand, one hundred eighteen".