169568661 has 16 divisors (see below), whose sum is σ = 234880128. Its totient is φ = 108729600.

The previous prime is 169568653. The next prime is 169568747. The reversal of 169568661 is 166865961.

169568661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 169568661 - 2³ = 169568653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 169568661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (169568611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976 + ... + 18441.

It is an arithmetic number, because the mean of its divisors is an integer number (14680008).

Almost surely, 2^169568661 is an apocalyptic number.

It is an amenable number.

169568661 is a deficient number, since it is larger than the sum of its proper divisors (65311467).

169568661 is a wasteful number, since it uses less digits than its factorization.

169568661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19532.

The product of its digits is 466560, while the sum is 48.

The square root of 169568661 is about 13021.8532091250. The cubic root of 169568661 is about 553.4969051987.

The spelling of 169568661 in words is "one hundred sixty-nine million, five hundred sixty-eight thousand, six hundred sixty-one".