166973497189 has 2 divisors, whose sum is σ = 166973497190. Its totient is φ = 166973497188.

The previous prime is 166973497087. The next prime is 166973497193. The reversal of 166973497189 is 981794379661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109197202500 + 57776294689 = 330450^2 + 240367^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166973497189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166973498189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83486748594 + 83486748595.

It is an arithmetic number, because the mean of its divisors is an integer number (83486748595).

Almost surely, 2^166973497189 is an apocalyptic number.

It is an amenable number.

166973497189 is a deficient number, since it is larger than the sum of its proper divisors (1).

166973497189 is an equidigital number, since it uses as much as digits as its factorization.

166973497189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123451776, while the sum is 70.

The spelling of 166973497189 in words is "one hundred sixty-six billion, nine hundred seventy-three million, four hundred ninety-seven thousand, one hundred eighty-nine".