55005648781721 has 16 divisors (see below), whose sum is σ = 61100154044160. Its totient is φ = 49098337667280.

The previous prime is 55005648781717. The next prime is 55005648781729. The reversal of 55005648781721 is 12718784650055.

It is not a de Polignac number, because 55005648781721 - 2² = 55005648781717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55005648781729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121328351 + ... + 121780868.

It is an arithmetic number, because the mean of its divisors is an integer number (3818759627760).

Almost surely, 2^{55005648781721} is an apocalyptic number.

It is an amenable number.

55005648781721 is a deficient number, since it is larger than the sum of its proper divisors (6094505262439).

55005648781721 is a wasteful number, since it uses less digits than its factorization.

55005648781721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243109604.

The product of its (nonzero) digits is 18816000, while the sum is 59.

The spelling of 55005648781721 in words is "fifty-five trillion, five billion, six hundred forty-eight million, seven hundred eighty-one thousand, seven hundred twenty-one".