55381109820456 has 128 divisors (see below), whose sum is σ = 160290863712000. Its totient is φ = 15617887076352.

The previous prime is 55381109820451. The next prime is 55381109820481. The reversal of 55381109820456 is 65402890118355.

It is a junction number, because it is equal to n+sod(n) for n = 55381109820396 and 55381109820405.

It is not an unprimeable number, because it can be changed into a prime (55381109820451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5252920 + ... + 11762456.

It is an arithmetic number, because the mean of its divisors is an integer number (1252272372750).

Almost surely, 2^{55381109820456} is an apocalyptic number.

55381109820456 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55381109820456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80145431856000).

55381109820456 is an abundant number, since it is smaller than the sum of its proper divisors (104909753891544).

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

55381109820456 is a wasteful number, since it uses less digits than its factorization.

55381109820456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510211 (or 6510207 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 57.

The spelling of 55381109820456 in words is "fifty-five trillion, three hundred eighty-one billion, one hundred nine million, eight hundred twenty thousand, four hundred fifty-six".