168406669 has 4 divisors (see below), whose sum is σ = 168437020. Its totient is φ = 168376320.

The previous prime is 168406661. The next prime is 168406673. The reversal of 168406669 is 966604861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52736644 + 115670025 = 7262^2 + 10755^2 .

It is a cyclic number.

It is not a de Polignac number, because 168406669 - 2³ = 168406661 is a prime.

It is a super-2 number, since 2×168406669² = 56721612327351122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168406661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4212 + ... + 18829.

It is an arithmetic number, because the mean of its divisors is an integer number (42109255).

Almost surely, 2^168406669 is an apocalyptic number.

It is an amenable number.

168406669 is a deficient number, since it is larger than the sum of its proper divisors (30351).

168406669 is an equidigital number, since it uses as much as digits as its factorization.

168406669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30350.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 168406669 is about 12977.1595120042. The cubic root of 168406669 is about 552.2297022817.

The spelling of 168406669 in words is "one hundred sixty-eight million, four hundred six thousand, six hundred sixty-nine".