209552371052543 has 4 divisors (see below), whose sum is σ = 209725126512168. Its totient is φ = 209379615592920.

The previous prime is 209552371052537. The next prime is 209552371052569. The reversal of 209552371052543 is 345250173255902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 209552371052543 - 2¹⁴ = 209552371036159 is a prime.

It is a super-2 number, since 2×209552371052543² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209552371052743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86377727993 + ... + 86377730418.

It is an arithmetic number, because the mean of its divisors is an integer number (52431281628042).

Almost surely, 2^{209552371052543} is an apocalyptic number.

209552371052543 is a deficient number, since it is larger than the sum of its proper divisors (172755459625).

209552371052543 is a wasteful number, since it uses less digits than its factorization.

209552371052543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172755459624.

The product of its (nonzero) digits is 11340000, while the sum is 53.

The spelling of 209552371052543 in words is "two hundred nine trillion, five hundred fifty-two billion, three hundred seventy-one million, fifty-two thousand, five hundred forty-three".