166048042789 has 2 divisors, whose sum is σ = 166048042790. Its totient is φ = 166048042788.

The previous prime is 166048042747. The next prime is 166048042819. The reversal of 166048042789 is 987240840661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165238185025 + 809857764 = 406495^2 + 28458^2 .

It is a cyclic number.

It is not a de Polignac number, because 166048042789 - 2²³ = 166039654181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166048042189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83024021394 + 83024021395.

It is an arithmetic number, because the mean of its divisors is an integer number (83024021395).

Almost surely, 2^166048042789 is an apocalyptic number.

It is an amenable number.

166048042789 is a deficient number, since it is larger than the sum of its proper divisors (1).

166048042789 is an equidigital number, since it uses as much as digits as its factorization.

166048042789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 166048042789 in words is "one hundred sixty-six billion, forty-eight million, forty-two thousand, seven hundred eighty-nine".