1243144355505 has 16 divisors (see below), whose sum is σ = 2142033351360. Its totient is φ = 612009528768.

The previous prime is 1243144355449. The next prime is 1243144355617. The reversal of 1243144355505 is 5055534413421.

It is not a de Polignac number, because 1243144355505 - 2¹⁰ = 1243144354481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3187549435 + ... + 3187549824.

It is an arithmetic number, because the mean of its divisors is an integer number (133877084460).

Almost surely, 2^{1243144355505} is an apocalyptic number.

1243144355505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1243144355505 is a deficient number, since it is larger than the sum of its proper divisors (898888995855).

1243144355505 is a wasteful number, since it uses less digits than its factorization.

1243144355505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6375099280.

The product of its (nonzero) digits is 720000, while the sum is 42.

Adding to 1243144355505 its reverse (5055534413421), we get a palindrome (6298678768926).

The spelling of 1243144355505 in words is "one trillion, two hundred forty-three billion, one hundred forty-four million, three hundred fifty-five thousand, five hundred five".