1808512679543 has 2 divisors, whose sum is σ = 1808512679544. Its totient is φ = 1808512679542.

The previous prime is 1808512679527. The next prime is 1808512679551. The reversal of 1808512679543 is 3459762158081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1808512679543 - 2⁴ = 1808512679527 is a prime.

It is a super-2 number, since 2×1808512679543² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1808512679143) 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, 904256339771 + 904256339772.

It is an arithmetic number, because the mean of its divisors is an integer number (904256339772).

It is a 1-persistent number, because it is pandigital, but 2⋅1808512679543 = 3617025359086 is not.

Almost surely, 2^{1808512679543} is an apocalyptic number.

1808512679543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808512679543 is an equidigital number, since it uses as much as digits as its factorization.

1808512679543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 1808512679543 in words is "one trillion, eight hundred eight billion, five hundred twelve million, six hundred seventy-nine thousand, five hundred forty-three".