168100644883861 has 2 divisors, whose sum is σ = 168100644883862. Its totient is φ = 168100644883860.

The previous prime is 168100644883859. The next prime is 168100644883879. The reversal of 168100644883861 is 168388446001861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153453996399025 + 14646648484836 = 12387655^2 + 3827094^2 .

It is a cyclic number.

It is not a de Polignac number, because 168100644883861 - 2¹ = 168100644883859 is a prime.

Together with 168100644883859, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 168100644883793 and 168100644883802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168100644833861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84050322441930 + 84050322441931.

It is an arithmetic number, because the mean of its divisors is an integer number (84050322441931).

Almost surely, 2^{168100644883861} is an apocalyptic number.

It is an amenable number.

168100644883861 is a deficient number, since it is larger than the sum of its proper divisors (1).

168100644883861 is an equidigital number, since it uses as much as digits as its factorization.

168100644883861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42467328, while the sum is 64.

The spelling of 168100644883861 in words is "one hundred sixty-eight trillion, one hundred billion, six hundred forty-four million, eight hundred eighty-three thousand, eight hundred sixty-one".