55150320221 has 2 divisors, whose sum is σ = 55150320222. Its totient is φ = 55150320220.

The previous prime is 55150320209. The next prime is 55150320263. The reversal of 55150320221 is 12202305155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29609805625 + 25540514596 = 172075^2 + 159814^2 .

It is a cyclic number.

It is not a de Polignac number, because 55150320221 - 2¹⁴ = 55150303837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55150320521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27575160110 + 27575160111.

It is an arithmetic number, because the mean of its divisors is an integer number (27575160111).

Almost surely, 2^55150320221 is an apocalyptic number.

It is an amenable number.

55150320221 is a deficient number, since it is larger than the sum of its proper divisors (1).

55150320221 is an equidigital number, since it uses as much as digits as its factorization.

55150320221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 55150320221 its reverse (12202305155), we get a palindrome (67352625376).

The spelling of 55150320221 in words is "fifty-five billion, one hundred fifty million, three hundred twenty thousand, two hundred twenty-one".