209010998854649 has 2 divisors, whose sum is σ = 209010998854650. Its totient is φ = 209010998854648.

The previous prime is 209010998854643. The next prime is 209010998854717. The reversal of 209010998854649 is 946458899010902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119152353670249 + 89858645184400 = 10915693^2 + 9479380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209010998854649 is a prime.

It is not a weakly prime, because it can be changed into another prime (209010998854643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104505499427324 + 104505499427325.

It is an arithmetic number, because the mean of its divisors is an integer number (104505499427325).

Almost surely, 2^{209010998854649} is an apocalyptic number.

It is an amenable number.

209010998854649 is a deficient number, since it is larger than the sum of its proper divisors (1).

209010998854649 is an equidigital number, since it uses as much as digits as its factorization.

209010998854649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403107840, while the sum is 74.

The spelling of 209010998854649 in words is "two hundred nine trillion, ten billion, nine hundred ninety-eight million, eight hundred fifty-four thousand, six hundred forty-nine".