1243205200543 has 8 divisors (see below), whose sum is σ = 1316435921568. Its totient is φ = 1169985702144.

The previous prime is 1243205200537. The next prime is 1243205200553. The reversal of 1243205200543 is 3450025023421.

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 1243205200543 - 2²¹ = 1243203103391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243205200553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2577046 + ... + 3021187.

It is an arithmetic number, because the mean of its divisors is an integer number (164554490196).

Almost surely, 2^{1243205200543} is an apocalyptic number.

1243205200543 is a deficient number, since it is larger than the sum of its proper divisors (73230721025).

1243205200543 is a wasteful number, since it uses less digits than its factorization.

1243205200543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5611313.

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 1243205200543 in words is "one trillion, two hundred forty-three billion, two hundred five million, two hundred thousand, five hundred forty-three".