671828434561 has 2 divisors, whose sum is σ = 671828434562. Its totient is φ = 671828434560.

The previous prime is 671828434531. The next prime is 671828434609. The reversal of 671828434561 is 165434828176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 608868090000 + 62960344561 = 780300^2 + 250919^2 .

It is a cyclic number.

It is not a de Polignac number, because 671828434561 - 2²⁷ = 671694216833 is a prime.

It is not a weakly prime, because it can be changed into another prime (671828434531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335914217280 + 335914217281.

It is an arithmetic number, because the mean of its divisors is an integer number (335914217281).

Almost surely, 2^671828434561 is an apocalyptic number.

It is an amenable number.

671828434561 is a deficient number, since it is larger than the sum of its proper divisors (1).

671828434561 is an equidigital number, since it uses as much as digits as its factorization.

671828434561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7741440, while the sum is 55.

The spelling of 671828434561 in words is "six hundred seventy-one billion, eight hundred twenty-eight million, four hundred thirty-four thousand, five hundred sixty-one".