209918979393559 has 2 divisors, whose sum is σ = 209918979393560. Its totient is φ = 209918979393558.

The previous prime is 209918979393553. The next prime is 209918979393583. The reversal of 209918979393559 is 955393979819902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209918979393559 - 2¹⁵ = 209918979360791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209918979393559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209918979393553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104959489696779 + 104959489696780.

It is an arithmetic number, because the mean of its divisors is an integer number (104959489696780).

Almost surely, 2^{209918979393559} is an apocalyptic number.

209918979393559 is a deficient number, since it is larger than the sum of its proper divisors (1).

209918979393559 is an equidigital number, since it uses as much as digits as its factorization.

209918979393559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13392313200, while the sum is 88.

The spelling of 209918979393559 in words is "two hundred nine trillion, nine hundred eighteen billion, nine hundred seventy-nine million, three hundred ninety-three thousand, five hundred fifty-nine".