166863158513 has 2 divisors, whose sum is σ = 166863158514. Its totient is φ = 166863158512.

The previous prime is 166863158509. The next prime is 166863158573. The reversal of 166863158513 is 315851368661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162479129569 + 4384028944 = 403087^2 + 66212^2 .

It is a cyclic number.

It is not a de Polignac number, because 166863158513 - 2² = 166863158509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166863158573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83431579256 + 83431579257.

It is an arithmetic number, because the mean of its divisors is an integer number (83431579257).

Almost surely, 2^166863158513 is an apocalyptic number.

It is an amenable number.

166863158513 is a deficient number, since it is larger than the sum of its proper divisors (1).

166863158513 is an equidigital number, since it uses as much as digits as its factorization.

166863158513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3110400, while the sum is 53.

The spelling of 166863158513 in words is "one hundred sixty-six billion, eight hundred sixty-three million, one hundred fifty-eight thousand, five hundred thirteen".