55285120636221 has 16 divisors (see below), whose sum is σ = 87906775670784. Its totient is φ = 30217954136304.

The previous prime is 55285120636211. The next prime is 55285120636237. The reversal of 55285120636221 is 12263602158255.

It is not a de Polignac number, because 55285120636221 - 2⁹ = 55285120635709 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55285120636211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57230973261 + ... + 57230974226.

It is an arithmetic number, because the mean of its divisors is an integer number (5494173479424).

Almost surely, 2^{55285120636221} is an apocalyptic number.

It is an amenable number.

55285120636221 is a deficient number, since it is larger than the sum of its proper divisors (32621655034563).

55285120636221 is a wasteful number, since it uses less digits than its factorization.

55285120636221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114461947520.

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 55285120636221 in words is "fifty-five trillion, two hundred eighty-five billion, one hundred twenty million, six hundred thirty-six thousand, two hundred twenty-one".