6656161 has 4 divisors (see below), whose sum is σ = 6670000. Its totient is φ = 6642324.

The previous prime is 6656123. The next prime is 6656171. The reversal of 6656161 is 1616566.

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.

It is a cyclic number.

It is not a de Polignac number, because 6656161 - 2¹¹ = 6654113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6656101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6171 + ... + 7168.

It is an arithmetic number, because the mean of its divisors is an integer number (1667500).

Almost surely, 2^6656161 is an apocalyptic number.

It is an amenable number.

6656161 is a deficient number, since it is larger than the sum of its proper divisors (13839).

6656161 is a wasteful number, since it uses less digits than its factorization.

6656161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13838.

The product of its digits is 6480, while the sum is 31.

The square root of 6656161 is about 2579.9536817548. The cubic root of 6656161 is about 188.1082916917.

The spelling of 6656161 in words is "six million, six hundred fifty-six thousand, one hundred sixty-one".