55205372009 has 2 divisors, whose sum is σ = 55205372010. Its totient is φ = 55205372008.

The previous prime is 55205372003. The next prime is 55205372083. The reversal of 55205372009 is 90027350255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40320640000 + 14884732009 = 200800^2 + 122003^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55205372009 is a prime.

It is not a weakly prime, because it can be changed into another prime (55205372003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27602686004 + 27602686005.

It is an arithmetic number, because the mean of its divisors is an integer number (27602686005).

Almost surely, 2^55205372009 is an apocalyptic number.

It is an amenable number.

55205372009 is a deficient number, since it is larger than the sum of its proper divisors (1).

55205372009 is an equidigital number, since it uses as much as digits as its factorization.

55205372009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94500, while the sum is 38.

The spelling of 55205372009 in words is "fifty-five billion, two hundred five million, three hundred seventy-two thousand, nine".