209797316822843 has 8 divisors (see below), whose sum is σ = 212111066217408. Its totient is φ = 207491587357824.

The previous prime is 209797316822837. The next prime is 209797316822861. The reversal of 209797316822843 is 348228613797902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 209797316822843 - 2²⁸ = 209797048387387 is a prime.

It is a super-3 number, since 3×209797316822843³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (209797316822893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2004929780 + ... + 2005034417.

It is an arithmetic number, because the mean of its divisors is an integer number (26513883277176).

Almost surely, 2^{209797316822843} is an apocalyptic number.

209797316822843 is a deficient number, since it is larger than the sum of its proper divisors (2313749394565).

209797316822843 is a wasteful number, since it uses less digits than its factorization.

209797316822843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009964773.

The product of its (nonzero) digits is 438939648, while the sum is 71.

The spelling of 209797316822843 in words is "two hundred nine trillion, seven hundred ninety-seven billion, three hundred sixteen million, eight hundred twenty-two thousand, eight hundred forty-three".