55980021619836 has 96 divisors (see below), whose sum is σ = 146585504943360. Its totient is φ = 18473534568000.

The previous prime is 55980021619807. The next prime is 55980021619861. The reversal of 55980021619836 is 63891612008955.

55980021619836 is a `hidden beast` number, since 5 + 5 + 9 + 8 + 0 + 0 + 2 + 1 + 619 + 8 + 3 + 6 = 666.

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, 16110186 + ... + 19274286.

It is an arithmetic number, because the mean of its divisors is an integer number (1526932343160).

Almost surely, 2^{55980021619836} 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 55980021619836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73292752471680).

55980021619836 is an abundant number, since it is smaller than the sum of its proper divisors (90605483323524).

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

55980021619836 is a wasteful number, since it uses less digits than its factorization.

55980021619836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3165752 (or 3165744 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 63.

The spelling of 55980021619836 in words is "fifty-five trillion, nine hundred eighty billion, twenty-one million, six hundred nineteen thousand, eight hundred thirty-six".