168901669 has 4 divisors (see below), whose sum is σ = 168941920. Its totient is φ = 168861420.

The previous prime is 168901661. The next prime is 168901679. The reversal of 168901669 is 966109861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 966109861 = 4603 ⋅209887.

It is a cyclic number.

It is not a de Polignac number, because 168901669 - 2³ = 168901661 is a prime.

It is a super-2 number, since 2×168901669² = 57055547581971122, 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 (168901661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12987 + ... + 22504.

It is an arithmetic number, because the mean of its divisors is an integer number (42235480).

Almost surely, 2^168901669 is an apocalyptic number.

It is an amenable number.

168901669 is a deficient number, since it is larger than the sum of its proper divisors (40251).

168901669 is an equidigital number, since it uses as much as digits as its factorization.

168901669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40250.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 168901669 is about 12996.2174881771. The cubic root of 168901669 is about 552.7702317763.

The spelling of 168901669 in words is "one hundred sixty-eight million, nine hundred one thousand, six hundred sixty-nine".