861842668273 has 2 divisors, whose sum is σ = 861842668274. Its totient is φ = 861842668272.

The previous prime is 861842668259. The next prime is 861842668373. The reversal of 861842668273 is 372866248168.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 768168108304 + 93674559969 = 876452^2 + 306063^2 .

It is a cyclic number.

It is not a de Polignac number, because 861842668273 - 2⁵ = 861842668241 is a prime.

It is not a weakly prime, because it can be changed into another prime (861842668373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430921334136 + 430921334137.

It is an arithmetic number, because the mean of its divisors is an integer number (430921334137).

Almost surely, 2^861842668273 is an apocalyptic number.

It is an amenable number.

861842668273 is a deficient number, since it is larger than the sum of its proper divisors (1).

861842668273 is an equidigital number, since it uses as much as digits as its factorization.

861842668273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37158912, while the sum is 61.

The spelling of 861842668273 in words is "eight hundred sixty-one billion, eight hundred forty-two million, six hundred sixty-eight thousand, two hundred seventy-three".