166863084257 has 2 divisors, whose sum is σ = 166863084258. Its totient is φ = 166863084256.

The previous prime is 166863084251. The next prime is 166863084331. The reversal of 166863084257 is 752480368661.

166863084257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163384915681 + 3478168576 = 404209^2 + 58976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166863084257 is a prime.

It is not a weakly prime, because it can be changed into another prime (166863084251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83431542128 + 83431542129.

It is an arithmetic number, because the mean of its divisors is an integer number (83431542129).

Almost surely, 2^166863084257 is an apocalyptic number.

It is an amenable number.

166863084257 is a deficient number, since it is larger than the sum of its proper divisors (1).

166863084257 is an equidigital number, since it uses as much as digits as its factorization.

166863084257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11612160, while the sum is 56.

The spelling of 166863084257 in words is "one hundred sixty-six billion, eight hundred sixty-three million, eighty-four thousand, two hundred fifty-seven".