209396823563 has 2 divisors, whose sum is σ = 209396823564. Its totient is φ = 209396823562.

The previous prime is 209396823547. The next prime is 209396823589. The reversal of 209396823563 is 365328693902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209396823563 - 2⁴ = 209396823547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209396823499 and 209396823508.

It is not a weakly prime, because it can be changed into another prime (209396823523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104698411781 + 104698411782.

It is an arithmetic number, because the mean of its divisors is an integer number (104698411782).

Almost surely, 2^209396823563 is an apocalyptic number.

209396823563 is a deficient number, since it is larger than the sum of its proper divisors (1).

209396823563 is an equidigital number, since it uses as much as digits as its factorization.

209396823563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12597120, while the sum is 56.

The spelling of 209396823563 in words is "two hundred nine billion, three hundred ninety-six million, eight hundred twenty-three thousand, five hundred sixty-three".