166601115959 has 2 divisors, whose sum is σ = 166601115960. Its totient is φ = 166601115958.

The previous prime is 166601115949. The next prime is 166601116013. The reversal of 166601115959 is 959511106661.

166601115959 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 166601115959 - 2¹² = 166601111863 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166601115949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83300557979 + 83300557980.

It is an arithmetic number, because the mean of its divisors is an integer number (83300557980).

Almost surely, 2^166601115959 is an apocalyptic number.

166601115959 is a deficient number, since it is larger than the sum of its proper divisors (1).

166601115959 is an equidigital number, since it uses as much as digits as its factorization.

166601115959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437400, while the sum is 50.

The spelling of 166601115959 in words is "one hundred sixty-six billion, six hundred one million, one hundred fifteen thousand, nine hundred fifty-nine".