208550681108251 has 2 divisors, whose sum is σ = 208550681108252. Its totient is φ = 208550681108250.

The previous prime is 208550681108249. The next prime is 208550681108351. The reversal of 208550681108251 is 152801186055802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 208550681108251 - 2¹ = 208550681108249 is a prime.

Together with 208550681108249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (208550681108351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104275340554125 + 104275340554126.

It is an arithmetic number, because the mean of its divisors is an integer number (104275340554126).

Almost surely, 2^{208550681108251} is an apocalyptic number.

208550681108251 is a deficient number, since it is larger than the sum of its proper divisors (1).

208550681108251 is an equidigital number, since it uses as much as digits as its factorization.

208550681108251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536000, while the sum is 52.

The spelling of 208550681108251 in words is "two hundred eight trillion, five hundred fifty billion, six hundred eighty-one million, one hundred eight thousand, two hundred fifty-one".