6646161 has 4 divisors (see below), whose sum is σ = 8861552. Its totient is φ = 4430772.

The previous prime is 6646153. The next prime is 6646163. The reversal of 6646161 is 1616466.

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 not a de Polignac number, because 6646161 - 2³ = 6646153 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6646163) 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 3 ways as a sum of consecutive naturals, for example, 1107691 + ... + 1107696.

It is an arithmetic number, because the mean of its divisors is an integer number (2215388).

Almost surely, 2^6646161 is an apocalyptic number.

It is an amenable number.

6646161 is a deficient number, since it is larger than the sum of its proper divisors (2215391).

6646161 is a wasteful number, since it uses less digits than its factorization.

6646161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2215390.

The product of its digits is 5184, while the sum is 30.

The square root of 6646161 is about 2578.0149340142. The cubic root of 6646161 is about 188.0140418816.

It can be divided in two parts, 664 and 6161, that multiplied together give a palindrome (4090904).

The spelling of 6646161 in words is "six million, six hundred forty-six thousand, one hundred sixty-one".