166681583933 has 2 divisors, whose sum is σ = 166681583934. Its totient is φ = 166681583932.

The previous prime is 166681583911. The next prime is 166681583941. The reversal of 166681583933 is 339385186661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124596292324 + 42085291609 = 352982^2 + 205147^2 .

It is a cyclic number.

It is not a de Polignac number, because 166681583933 - 2¹⁰ = 166681582909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166681585933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83340791966 + 83340791967.

It is an arithmetic number, because the mean of its divisors is an integer number (83340791967).

Almost surely, 2^166681583933 is an apocalyptic number.

It is an amenable number.

166681583933 is a deficient number, since it is larger than the sum of its proper divisors (1).

166681583933 is an equidigital number, since it uses as much as digits as its factorization.

166681583933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16796160, while the sum is 59.

The spelling of 166681583933 in words is "one hundred sixty-six billion, six hundred eighty-one million, five hundred eighty-three thousand, nine hundred thirty-three".