160664561 has 2 divisors, whose sum is σ = 160664562. Its totient is φ = 160664560.

The previous prime is 160664549. The next prime is 160664563. The reversal of 160664561 is 165466061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96904336 + 63760225 = 9844^2 + 7985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-160664561 is a prime.

It is a super-2 number, since 2×160664561² = 51626202322645442, which contains 22 as substring.

Together with 160664563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (160664563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80332280 + 80332281.

It is an arithmetic number, because the mean of its divisors is an integer number (80332281).

Almost surely, 2^160664561 is an apocalyptic number.

It is an amenable number.

160664561 is a deficient number, since it is larger than the sum of its proper divisors (1).

160664561 is an equidigital number, since it uses as much as digits as its factorization.

160664561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 160664561 is about 12675.3525000293. The cubic root of 160664561 is about 543.6341084585.

The spelling of 160664561 in words is "one hundred sixty million, six hundred sixty-four thousand, five hundred sixty-one".