166666851853 has 4 divisors (see below), whose sum is σ = 169399095388. Its totient is φ = 163934608320.

The previous prime is 166666851821. The next prime is 166666851889. The reversal of 166666851853 is 358158666661.

166666851853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80464130244 + 86202721609 = 283662^2 + 293603^2 .

It is a cyclic number.

It is not a de Polignac number, because 166666851853 - 2⁵ = 166666851821 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61), and also a Moran number because the ratio is a prime number: 2732243473 = 166666851853 / (1 + 6 + 6 + 6 + 6 + 6 + 8 + 5 + 1 + 8 + 5 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166666851791 and 166666851800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666851893) 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 in 3 ways as a sum of consecutive naturals, for example, 1366121676 + ... + 1366121797.

It is an arithmetic number, because the mean of its divisors is an integer number (42349773847).

Almost surely, 2^166666851853 is an apocalyptic number.

It is an amenable number.

166666851853 is a deficient number, since it is larger than the sum of its proper divisors (2732243535).

166666851853 is an equidigital number, since it uses as much as digits as its factorization.

166666851853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732243534.

The product of its digits is 37324800, while the sum is 61.

The spelling of 166666851853 in words is "one hundred sixty-six billion, six hundred sixty-six million, eight hundred fifty-one thousand, eight hundred fifty-three".