166375375193 has 2 divisors, whose sum is σ = 166375375194. Its totient is φ = 166375375192.

The previous prime is 166375375171. The next prime is 166375375211. The reversal of 166375375193 is 391573573661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114858632464 + 51516742729 = 338908^2 + 226973^2 .

It is a cyclic number.

It is not a de Polignac number, because 166375375193 - 2¹⁰ = 166375374169 is a prime.

It is a super-2 number, since 2×166375375193² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166375375123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83187687596 + 83187687597.

It is an arithmetic number, because the mean of its divisors is an integer number (83187687597).

Almost surely, 2^166375375193 is an apocalyptic number.

It is an amenable number.

166375375193 is a deficient number, since it is larger than the sum of its proper divisors (1).

166375375193 is an equidigital number, since it uses as much as digits as its factorization.

166375375193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10716300, while the sum is 56.

The spelling of 166375375193 in words is "one hundred sixty-six billion, three hundred seventy-five million, three hundred seventy-five thousand, one hundred ninety-three".