861842668241 has 2 divisors, whose sum is σ = 861842668242. Its totient is φ = 861842668240.

The previous prime is 861842668237. The next prime is 861842668259. The reversal of 861842668241 is 142866248168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 720970810000 + 140871858241 = 849100^2 + 375329^2 .

It is a cyclic number.

It is not a de Polignac number, because 861842668241 - 2² = 861842668237 is a prime.

It is not a weakly prime, because it can be changed into another prime (861842667241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430921334120 + 430921334121.

It is an arithmetic number, because the mean of its divisors is an integer number (430921334121).

Almost surely, 2^861842668241 is an apocalyptic number.

It is an amenable number.

861842668241 is a deficient number, since it is larger than the sum of its proper divisors (1).

861842668241 is an equidigital number, since it uses as much as digits as its factorization.

861842668241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7077888, while the sum is 56.

The spelling of 861842668241 in words is "eight hundred sixty-one billion, eight hundred forty-two million, six hundred sixty-eight thousand, two hundred forty-one".