55171220132 has 72 divisors (see below), whose sum is σ = 119088093600. Its totient is φ = 22236633216.

The previous prime is 55171220131. The next prime is 55171220141. The reversal of 55171220132 is 23102217155.

It is a junction number, because it is equal to n+sod(n) for n = 55171220095 and 55171220104.

It is not an unprimeable number, because it can be changed into a prime (55171220131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 456119 + ... + 564257.

It is an arithmetic number, because the mean of its divisors is an integer number (1654001300).

Almost surely, 2^55171220132 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 55171220132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59544046800).

55171220132 is an abundant number, since it is smaller than the sum of its proper divisors (63916873468).

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

55171220132 is a wasteful number, since it uses less digits than its factorization.

55171220132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108313 (or 108304 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 55171220132 its reverse (23102217155), we get a palindrome (78273437287).

The spelling of 55171220132 in words is "fifty-five billion, one hundred seventy-one million, two hundred twenty thousand, one hundred thirty-two".