163945669 has 2 divisors, whose sum is σ = 163945670. Its totient is φ = 163945668.

The previous prime is 163945657. The next prime is 163945673. The reversal of 163945669 is 966549361.

163945669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83484769 + 80460900 = 9137^2 + 8970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163945669 is a prime.

It is a super-2 number, since 2×163945669² = 53756364767715122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163945469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81972834 + 81972835.

It is an arithmetic number, because the mean of its divisors is an integer number (81972835).

Almost surely, 2^163945669 is an apocalyptic number.

It is an amenable number.

163945669 is a deficient number, since it is larger than the sum of its proper divisors (1).

163945669 is an equidigital number, since it uses as much as digits as its factorization.

163945669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 49.

The square root of 163945669 is about 12804.1270299853. The cubic root of 163945669 is about 547.3099153170.

The spelling of 163945669 in words is "one hundred sixty-three million, nine hundred forty-five thousand, six hundred sixty-nine".