163664791 has 2 divisors, whose sum is σ = 163664792. Its totient is φ = 163664790.

The previous prime is 163664789. The next prime is 163664833. The reversal of 163664791 is 197466361.

163664791 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 is a cyclic number.

It is not a de Polignac number, because 163664791 - 2¹ = 163664789 is a prime.

Together with 163664789, it forms a pair of twin primes.

It is a congruent number.

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, 81832395 + 81832396.

It is an arithmetic number, because the mean of its divisors is an integer number (81832396).

Almost surely, 2^163664791 is an apocalyptic number.

163664791 is a deficient number, since it is larger than the sum of its proper divisors (1).

163664791 is an equidigital number, since it uses as much as digits as its factorization.

163664791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 163664791 is about 12793.1540677036. The cubic root of 163664791 is about 546.9971792147.

The spelling of 163664791 in words is "one hundred sixty-three million, six hundred sixty-four thousand, seven hundred ninety-one".