55916166209 has 2 divisors, whose sum is σ = 55916166210. Its totient is φ = 55916166208.

The previous prime is 55916166191. The next prime is 55916166221. The reversal of 55916166209 is 90266161955.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47089000000 + 8827166209 = 217000^2 + 93953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55916166209 is a prime.

It is not a weakly prime, because it can be changed into another prime (55916166239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27958083104 + 27958083105.

It is an arithmetic number, because the mean of its divisors is an integer number (27958083105).

Almost surely, 2^55916166209 is an apocalyptic number.

It is an amenable number.

55916166209 is a deficient number, since it is larger than the sum of its proper divisors (1).

55916166209 is an equidigital number, since it uses as much as digits as its factorization.

55916166209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 50.

The spelling of 55916166209 in words is "fifty-five billion, nine hundred sixteen million, one hundred sixty-six thousand, two hundred nine".