163664771 has 2 divisors, whose sum is σ = 163664772. Its totient is φ = 163664770.

The previous prime is 163664741. The next prime is 163664789. The reversal of 163664771 is 177466361.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163664771 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163664731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81832385 + 81832386.

It is an arithmetic number, because the mean of its divisors is an integer number (81832386).

Almost surely, 2^163664771 is an apocalyptic number.

163664771 is a deficient number, since it is larger than the sum of its proper divisors (1).

163664771 is an equidigital number, since it uses as much as digits as its factorization.

163664771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 41.

The square root of 163664771 is about 12793.1532860355. The cubic root of 163664771 is about 546.9971569335.

The spelling of 163664771 in words is "one hundred sixty-three million, six hundred sixty-four thousand, seven hundred seventy-one".