209023197945563 has 2 divisors, whose sum is σ = 209023197945564. Its totient is φ = 209023197945562.

The previous prime is 209023197945559. The next prime is 209023197945571. The reversal of 209023197945563 is 365549791320902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209023197945563 - 2² = 209023197945559 is a prime.

It is a super-2 number, since 2×209023197945563² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 209023197945563.

It is not a weakly prime, because it can be changed into another prime (209023197941563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104511598972781 + 104511598972782.

It is an arithmetic number, because the mean of its divisors is an integer number (104511598972782).

Almost surely, 2^{209023197945563} is an apocalyptic number.

209023197945563 is a deficient number, since it is larger than the sum of its proper divisors (1).

209023197945563 is an equidigital number, since it uses as much as digits as its factorization.

209023197945563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110224800, while the sum is 65.

The spelling of 209023197945563 in words is "two hundred nine trillion, twenty-three billion, one hundred ninety-seven million, nine hundred forty-five thousand, five hundred sixty-three".