166863838042897 has 2 divisors, whose sum is σ = 166863838042898. Its totient is φ = 166863838042896.

The previous prime is 166863838042877. The next prime is 166863838042931. The reversal of 166863838042897 is 798240838368661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147055009637376 + 19808828405521 = 12126624^2 + 4450711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166863838042897 is a prime.

It is not a weakly prime, because it can be changed into another prime (166863838042877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83431919021448 + 83431919021449.

It is an arithmetic number, because the mean of its divisors is an integer number (83431919021449).

Almost surely, 2^{166863838042897} is an apocalyptic number.

It is an amenable number.

166863838042897 is a deficient number, since it is larger than the sum of its proper divisors (1).

166863838042897 is an equidigital number, since it uses as much as digits as its factorization.

166863838042897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4013162496, while the sum is 79.

The spelling of 166863838042897 in words is "one hundred sixty-six trillion, eight hundred sixty-three billion, eight hundred thirty-eight million, forty-two thousand, eight hundred ninety-seven".