163664489 has 2 divisors, whose sum is σ = 163664490. Its totient is φ = 163664488.

The previous prime is 163664453. The next prime is 163664513. The reversal of 163664489 is 984466361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137827600 + 25836889 = 11740^2 + 5083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163664489 is a prime.

It is a super-2 number, since 2×163664489² = 53572129919262242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163664419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81832244 + 81832245.

It is an arithmetic number, because the mean of its divisors is an integer number (81832245).

Almost surely, 2^163664489 is an apocalyptic number.

It is an amenable number.

163664489 is a deficient number, since it is larger than the sum of its proper divisors (1).

163664489 is an equidigital number, since it uses as much as digits as its factorization.

163664489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 47.

The square root of 163664489 is about 12793.1422645103. The cubic root of 163664489 is about 546.9968427684.

The spelling of 163664489 in words is "one hundred sixty-three million, six hundred sixty-four thousand, four hundred eighty-nine".