381664163 has 2 divisors, whose sum is σ = 381664164. Its totient is φ = 381664162.

The previous prime is 381664159. The next prime is 381664169. The reversal of 381664163 is 361466183.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381664163 - 2² = 381664159 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381664169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190832081 + 190832082.

It is an arithmetic number, because the mean of its divisors is an integer number (190832082).

Almost surely, 2^381664163 is an apocalyptic number.

381664163 is a deficient number, since it is larger than the sum of its proper divisors (1).

381664163 is an equidigital number, since it uses as much as digits as its factorization.

381664163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 381664163 is about 19536.2269386901. The cubic root of 381664163 is about 725.3714548364.

The spelling of 381664163 in words is "three hundred eighty-one million, six hundred sixty-four thousand, one hundred sixty-three".