168388669 has 2 divisors, whose sum is σ = 168388670. Its totient is φ = 168388668.

The previous prime is 168388663. The next prime is 168388691. The reversal of 168388669 is 966883861.

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., 166023225 + 2365444 = 12885^2 + 1538^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168388669 is a prime.

It is a super-2 number, since 2×168388669² = 56709487695183122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168388663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84194334 + 84194335.

It is an arithmetic number, because the mean of its divisors is an integer number (84194335).

Almost surely, 2^168388669 is an apocalyptic number.

It is an amenable number.

168388669 is a deficient number, since it is larger than the sum of its proper divisors (1).

168388669 is an equidigital number, since it uses as much as digits as its factorization.

168388669 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 168388669 is about 12976.4659672809. The cubic root of 168388669 is about 552.2100267172.

The spelling of 168388669 in words is "one hundred sixty-eight million, three hundred eighty-eight thousand, six hundred sixty-nine".