8631198642161 has 2 divisors, whose sum is σ = 8631198642162. Its totient is φ = 8631198642160.

The previous prime is 8631198642151. The next prime is 8631198642239. The reversal of 8631198642161 is 1612468911368.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8580593440225 + 50605201936 = 2929265^2 + 224956^2 .

It is a cyclic number.

It is not a de Polignac number, because 8631198642161 - 2¹⁸ = 8631198380017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8631198642097 and 8631198642106.

It is not a weakly prime, because it can be changed into another prime (8631198642151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4315599321080 + 4315599321081.

It is an arithmetic number, because the mean of its divisors is an integer number (4315599321081).

Almost surely, 2^{8631198642161} is an apocalyptic number.

It is an amenable number.

8631198642161 is a deficient number, since it is larger than the sum of its proper divisors (1).

8631198642161 is an equidigital number, since it uses as much as digits as its factorization.

8631198642161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 56.

The spelling of 8631198642161 in words is "eight trillion, six hundred thirty-one billion, one hundred ninety-eight million, six hundred forty-two thousand, one hundred sixty-one".