1812738833447 has 16 divisors (see below), whose sum is σ = 1950463162368. Its totient is φ = 1680711970080.

The previous prime is 1812738833443. The next prime is 1812738833449. The reversal of 1812738833447 is 7443388372181.

It is a cyclic number.

It is not a de Polignac number, because 1812738833447 - 2² = 1812738833443 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 (1812738833443) 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 15 ways as a sum of consecutive naturals, for example, 8857079 + ... + 9059432.

It is an arithmetic number, because the mean of its divisors is an integer number (121903947648).

Almost surely, 2^{1812738833447} is an apocalyptic number.

1812738833447 is a deficient number, since it is larger than the sum of its proper divisors (137724328921).

1812738833447 is a wasteful number, since it uses less digits than its factorization.

1812738833447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17916670.

The product of its digits is 21676032, while the sum is 59.

The spelling of 1812738833447 in words is "one trillion, eight hundred twelve billion, seven hundred thirty-eight million, eight hundred thirty-three thousand, four hundred forty-seven".