1021744165543 has 2 divisors, whose sum is σ = 1021744165544. Its totient is φ = 1021744165542.

The previous prime is 1021744165511. The next prime is 1021744165583. The reversal of 1021744165543 is 3455614471201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1021744165543 - 2⁵ = 1021744165511 is a prime.

It is a super-2 number, since 2×1021744165543² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1021744165543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021744165583) 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 as a sum of consecutive naturals, namely, 510872082771 + 510872082772.

It is an arithmetic number, because the mean of its divisors is an integer number (510872082772).

Almost surely, 2^{1021744165543} is an apocalyptic number.

1021744165543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021744165543 is an equidigital number, since it uses as much as digits as its factorization.

1021744165543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 1021744165543 in words is "one trillion, twenty-one billion, seven hundred forty-four million, one hundred sixty-five thousand, five hundred forty-three".