861181966233361 has 2 divisors, whose sum is σ = 861181966233362. Its totient is φ = 861181966233360.

The previous prime is 861181966233317. The next prime is 861181966233409. The reversal of 861181966233361 is 163332669181168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 563275747031761 + 297906219201600 = 23733431^2 + 17259960^2 .

It is a cyclic number.

It is not a de Polignac number, because 861181966233361 - 2³¹ = 861179818749713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861181966233293 and 861181966233302.

It is not a weakly prime, because it can be changed into another prime (861181966231361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430590983116680 + 430590983116681.

It is an arithmetic number, because the mean of its divisors is an integer number (430590983116681).

Almost surely, 2^{861181966233361} is an apocalyptic number.

It is an amenable number.

861181966233361 is a deficient number, since it is larger than the sum of its proper divisors (1).

861181966233361 is an equidigital number, since it uses as much as digits as its factorization.

861181966233361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40310784, while the sum is 64.

The spelling of 861181966233361 in words is "eight hundred sixty-one trillion, one hundred eighty-one billion, nine hundred sixty-six million, two hundred thirty-three thousand, three hundred sixty-one".