55551101010020 has 144 divisors (see below), whose sum is σ = 148072454611200. Its totient is φ = 17310842035200.

The previous prime is 55551101010019. The next prime is 55551101010029. The reversal of 55551101010020 is 2001010115555.

It is not an unprimeable number, because it can be changed into a prime (55551101010029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48929756 + ... + 50052204.

It is an arithmetic number, because the mean of its divisors is an integer number (1028280934800).

Almost surely, 2^{55551101010020} 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 55551101010020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74036227305600).

55551101010020 is an abundant number, since it is smaller than the sum of its proper divisors (92521353601180).

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

55551101010020 is a wasteful number, since it uses less digits than its factorization.

55551101010020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127074 (or 1127065 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 26.

Adding to 55551101010020 its reverse (2001010115555), we get a palindrome (57552111125575).

The spelling of 55551101010020 in words is "fifty-five trillion, five hundred fifty-one billion, one hundred one million, ten thousand, twenty".