166141009 has 2 divisors, whose sum is σ = 166141010. Its totient is φ = 166141008.

The previous prime is 166141007. The next prime is 166141033. The reversal of 166141009 is 900141661.

166141009 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 can be written as a sum of positive squares in only one way, i.e., 115089984 + 51051025 = 10728^2 + 7145^2 .

It is a cyclic number.

It is not a de Polignac number, because 166141009 - 2¹ = 166141007 is a prime.

Together with 166141007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (166141007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83070504 + 83070505.

It is an arithmetic number, because the mean of its divisors is an integer number (83070505).

Almost surely, 2^166141009 is an apocalyptic number.

It is an amenable number.

166141009 is a deficient number, since it is larger than the sum of its proper divisors (1).

166141009 is an equidigital number, since it uses as much as digits as its factorization.

166141009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 166141009 is about 12889.5697755976. The cubic root of 166141009 is about 549.7420377065.

The spelling of 166141009 in words is "one hundred sixty-six million, one hundred forty-one thousand, nine".