163868869 has 2 divisors, whose sum is σ = 163868870. Its totient is φ = 163868868.

The previous prime is 163868857. The next prime is 163868897. The reversal of 163868869 is 968868361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98743969 + 65124900 = 9937^2 + 8070^2 .

It is a cyclic number.

It is not a de Polignac number, because 163868869 - 2⁷ = 163868741 is a prime.

It is a super-2 number, since 2×163868869² = 53706012454678322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163868839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81934434 + 81934435.

It is an arithmetic number, because the mean of its divisors is an integer number (81934435).

Almost surely, 2^163868869 is an apocalyptic number.

It is an amenable number.

163868869 is a deficient number, since it is larger than the sum of its proper divisors (1).

163868869 is an equidigital number, since it uses as much as digits as its factorization.

163868869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 55.

The square root of 163868869 is about 12801.1276456412. The cubic root of 163868869 is about 547.2244399134.

It can be divided in two parts, 1638 and 68869, that added together give a palindrome (70507).

The spelling of 163868869 in words is "one hundred sixty-three million, eight hundred sixty-eight thousand, eight hundred sixty-nine".