166657872869 has 2 divisors, whose sum is σ = 166657872870. Its totient is φ = 166657872868.

The previous prime is 166657872863. The next prime is 166657872881. The reversal of 166657872869 is 968278756661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99492930625 + 67164942244 = 315425^2 + 259162^2 .

It is a cyclic number.

It is not a de Polignac number, because 166657872869 - 2⁴ = 166657872853 is a prime.

It is a super-2 number, since 2×166657872869² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166657872863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83328936434 + 83328936435.

It is an arithmetic number, because the mean of its divisors is an integer number (83328936435).

Almost surely, 2^166657872869 is an apocalyptic number.

It is an amenable number.

166657872869 is a deficient number, since it is larger than the sum of its proper divisors (1).

166657872869 is an equidigital number, since it uses as much as digits as its factorization.

166657872869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 365783040, while the sum is 71.

The spelling of 166657872869 in words is "one hundred sixty-six billion, six hundred fifty-seven million, eight hundred seventy-two thousand, eight hundred sixty-nine".