55399221248 has 108 divisors (see below), whose sum is σ = 129030178095. Its totient is φ = 23710568448.

The previous prime is 55399221247. The next prime is 55399221259. The reversal of 55399221248 is 84212299355.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 27699610624 + 27699610624 = 166432^2 + 166432^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=166432.

It is a junction number, because it is equal to n+sod(n) for n = 55399221196 and 55399221205.

It is not an unprimeable number, because it can be changed into a prime (55399221247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 74561165 + ... + 74561907.

Almost surely, 2^55399221248 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 55399221248

55399221248 is an abundant number, since it is smaller than the sum of its proper divisors (73630956847).

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

55399221248 is an frugal number, since it uses more digits than its factorization.

55399221248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 752 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 50.

Multiplying 55399221248 by its sum of digits (50), we get a square (2769961062400 = 1664320²).

The spelling of 55399221248 in words is "fifty-five billion, three hundred ninety-nine million, two hundred twenty-one thousand, two hundred forty-eight".