160661009 has 2 divisors, whose sum is σ = 160661010. Its totient is φ = 160661008.

The previous prime is 160660991. The next prime is 160661023. The reversal of 160661009 is 900166061.

160661009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88360000 + 72301009 = 9400^2 + 8503^2 .

It is a cyclic number.

It is not a de Polignac number, because 160661009 - 2¹⁶ = 160595473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_9009515 and since 160661009 and 9009515 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (160661069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80330504 + 80330505.

It is an arithmetic number, because the mean of its divisors is an integer number (80330505).

Almost surely, 2^160661009 is an apocalyptic number.

It is an amenable number.

160661009 is a deficient number, since it is larger than the sum of its proper divisors (1).

160661009 is an equidigital number, since it uses as much as digits as its factorization.

160661009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 160661009 is about 12675.2123848084. The cubic root of 160661009 is about 543.6301021766.

The spelling of 160661009 in words is "one hundred sixty million, six hundred sixty-one thousand, nine".