55378640221312 has 128 divisors (see below), whose sum is σ = 118479562565760. Its totient is φ = 25719951409152.

The previous prime is 55378640221291. The next prime is 55378640221349. The reversal of 55378640221312 is 21312204687355.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20636088 + ... + 23164744.

It is an arithmetic number, because the mean of its divisors is an integer number (925621582545).

Almost surely, 2^{55378640221312} 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 55378640221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59239781282880).

55378640221312 is an abundant number, since it is smaller than the sum of its proper divisors (63100922344448).

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

55378640221312 is a wasteful number, since it uses less digits than its factorization.

55378640221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528910 (or 2528898 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 55378640221312 in words is "fifty-five trillion, three hundred seventy-eight billion, six hundred forty million, two hundred twenty-one thousand, three hundred twelve".