163667689 has 2 divisors, whose sum is σ = 163667690. Its totient is φ = 163667688.

The previous prime is 163667671. The next prime is 163667717. The reversal of 163667689 is 986766361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157251600 + 6416089 = 12540^2 + 2533^2 .

It is a cyclic number.

It is not a de Polignac number, because 163667689 - 2¹⁹ = 163143401 is a prime.

It is a super-2 number, since 2×163667689² = 53574224845201442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (163667629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81833844 + 81833845.

It is an arithmetic number, because the mean of its divisors is an integer number (81833845).

Almost surely, 2^163667689 is an apocalyptic number.

It is an amenable number.

163667689 is a deficient number, since it is larger than the sum of its proper divisors (1).

163667689 is an equidigital number, since it uses as much as digits as its factorization.

163667689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 52.

The square root of 163667689 is about 12793.2673309050. The cubic root of 163667689 is about 547.0004077414. Note that the first 3 decimals are identical.

The spelling of 163667689 in words is "one hundred sixty-three million, six hundred sixty-seven thousand, six hundred eighty-nine".