169668921 has 8 divisors (see below), whose sum is σ = 233522944. Its totient is φ = 109463760.

The previous prime is 169668899. The next prime is 169668997. The reversal of 169668921 is 129866961.

169668921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 169668921 - 2¹¹ = 169666873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (169660921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 912106 + ... + 912291.

It is an arithmetic number, because the mean of its divisors is an integer number (29190368).

Almost surely, 2^169668921 is an apocalyptic number.

It is an amenable number.

169668921 is a deficient number, since it is larger than the sum of its proper divisors (63854023).

169668921 is a wasteful number, since it uses less digits than its factorization.

169668921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1824431.

The product of its digits is 279936, while the sum is 48.

The square root of 169668921 is about 13025.7023227157. The cubic root of 169668921 is about 553.6059714727.

The spelling of 169668921 in words is "one hundred sixty-nine million, six hundred sixty-eight thousand, nine hundred twenty-one".