166851864623 has 2 divisors, whose sum is σ = 166851864624. Its totient is φ = 166851864622.

The previous prime is 166851864589. The next prime is 166851864637. The reversal of 166851864623 is 326468158661.

166851864623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166851864623 - 2³⁶ = 98132387887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166851864643) 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, 83425932311 + 83425932312.

It is an arithmetic number, because the mean of its divisors is an integer number (83425932312).

Almost surely, 2^166851864623 is an apocalyptic number.

166851864623 is a deficient number, since it is larger than the sum of its proper divisors (1).

166851864623 is an equidigital number, since it uses as much as digits as its factorization.

166851864623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 56.

The spelling of 166851864623 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-four thousand, six hundred twenty-three".