166666685293 has 2 divisors, whose sum is σ = 166666685294. Its totient is φ = 166666685292.

The previous prime is 166666685261. The next prime is 166666685327. The reversal of 166666685293 is 392586666661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159031071369 + 7635613924 = 398787^2 + 87382^2 .

It is a cyclic number.

It is not a de Polignac number, because 166666685293 - 2⁵ = 166666685261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166666685243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83333342646 + 83333342647.

It is an arithmetic number, because the mean of its divisors is an integer number (83333342647).

Almost surely, 2^166666685293 is an apocalyptic number.

It is an amenable number.

166666685293 is a deficient number, since it is larger than the sum of its proper divisors (1).

166666685293 is an equidigital number, since it uses as much as digits as its factorization.

166666685293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100776960, while the sum is 64.

The spelling of 166666685293 in words is "one hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-five thousand, two hundred ninety-three".