55811881020 has 144 divisors (see below), whose sum is σ = 182225151360. Its totient is φ = 12726274176.

The previous prime is 55811880977. The next prime is 55811881051. The reversal of 55811881020 is 2018811855.

It is a super-2 number, since 2×55811881020² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55811881020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1209207 + ... + 1254513.

It is an arithmetic number, because the mean of its divisors is an integer number (1265452440).

Almost surely, 2^55811881020 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 55811881020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91112575680).

55811881020 is an abundant number, since it is smaller than the sum of its proper divisors (126413270340).

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

55811881020 is a wasteful number, since it uses less digits than its factorization.

55811881020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45752 (or 45743 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 39.

The spelling of 55811881020 in words is "fifty-five billion, eight hundred eleven million, eight hundred eighty-one thousand, twenty".