656004161 has 4 divisors (see below), whose sum is σ = 668381652. Its totient is φ = 643626672.

The previous prime is 656004119. The next prime is 656004197. The reversal of 656004161 is 161400656.

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 588353536 + 67650625 = 24256^2 + 8225^2 .

It is a cyclic number.

It is not a de Polignac number, because 656004161 - 2¹⁴ = 655987777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656004101) 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, 6188666 + ... + 6188771.

It is an arithmetic number, because the mean of its divisors is an integer number (167095413).

Almost surely, 2^656004161 is an apocalyptic number.

It is an amenable number.

656004161 is a deficient number, since it is larger than the sum of its proper divisors (12377491).

656004161 is a wasteful number, since it uses less digits than its factorization.

656004161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12377490.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 656004161 is about 25612.5781794805. The cubic root of 656004161 is about 868.8981342827.

The spelling of 656004161 in words is "six hundred fifty-six million, four thousand, one hundred sixty-one".