166011561539 has 2 divisors, whose sum is σ = 166011561540. Its totient is φ = 166011561538.

The previous prime is 166011561511. The next prime is 166011561581. The reversal of 166011561539 is 935165110661.

166011561539 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 166011561539 - 2¹² = 166011557443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166011561539.

It is not a weakly prime, because it can be changed into another prime (166011561589) 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, 83005780769 + 83005780770.

It is an arithmetic number, because the mean of its divisors is an integer number (83005780770).

Almost surely, 2^166011561539 is an apocalyptic number.

166011561539 is a deficient number, since it is larger than the sum of its proper divisors (1).

166011561539 is an equidigital number, since it uses as much as digits as its factorization.

166011561539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145800, while the sum is 44.

The spelling of 166011561539 in words is "one hundred sixty-six billion, eleven million, five hundred sixty-one thousand, five hundred thirty-nine".