166863158851 has 2 divisors, whose sum is σ = 166863158852. Its totient is φ = 166863158850.

The previous prime is 166863158849. The next prime is 166863158893. The reversal of 166863158851 is 158851368661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166863158851 - 2¹ = 166863158849 is a prime.

Together with 166863158849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166863158821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83431579425 + 83431579426.

It is an arithmetic number, because the mean of its divisors is an integer number (83431579426).

Almost surely, 2^166863158851 is an apocalyptic number.

166863158851 is a deficient number, since it is larger than the sum of its proper divisors (1).

166863158851 is an equidigital number, since it uses as much as digits as its factorization.

166863158851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8294400, while the sum is 58.

The spelling of 166863158851 in words is "one hundred sixty-six billion, eight hundred sixty-three million, one hundred fifty-eight thousand, eight hundred fifty-one".