166681583911 has 2 divisors, whose sum is σ = 166681583912. Its totient is φ = 166681583910.

The previous prime is 166681583891. The next prime is 166681583933. The reversal of 166681583911 is 119385186661.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166681583911 - 2²⁹ = 166144712999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166681583941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83340791955 + 83340791956.

It is an arithmetic number, because the mean of its divisors is an integer number (83340791956).

Almost surely, 2^166681583911 is an apocalyptic number.

166681583911 is a deficient number, since it is larger than the sum of its proper divisors (1).

166681583911 is an equidigital number, since it uses as much as digits as its factorization.

166681583911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 55.

The spelling of 166681583911 in words is "one hundred sixty-six billion, six hundred eighty-one million, five hundred eighty-three thousand, nine hundred eleven".