6656181 has 8 divisors (see below), whose sum is σ = 10142784. Its totient is φ = 3803520.

The previous prime is 6656171. The next prime is 6656183. The reversal of 6656181 is 1816566.

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

It is not a de Polignac number, because 6656181 - 2¹⁵ = 6623413 is a prime.

It is a super-2 number, since 2×6656181² = 88609491009522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656183) 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 7 ways as a sum of consecutive naturals, for example, 158460 + ... + 158501.

It is an arithmetic number, because the mean of its divisors is an integer number (1267848).

Almost surely, 2^6656181 is an apocalyptic number.

It is an amenable number.

6656181 is a deficient number, since it is larger than the sum of its proper divisors (3486603).

6656181 is a wasteful number, since it uses less digits than its factorization.

6656181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316971.

The product of its digits is 8640, while the sum is 33.

The square root of 6656181 is about 2579.9575577904. The cubic root of 6656181 is about 188.1084800967.

The spelling of 6656181 in words is "six million, six hundred fifty-six thousand, one hundred eighty-one".