6656413 has 4 divisors (see below), whose sum is σ = 6871168. Its totient is φ = 6441660.

The previous prime is 6656393. The next prime is 6656437. The reversal of 6656413 is 3146566.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3146566 = 2 ⋅1573283.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6656413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 214723 = 6656413 / (6 + 6 + 5 + 6 + 4 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656483) 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, 107331 + ... + 107392.

It is an arithmetic number, because the mean of its divisors is an integer number (1717792).

Almost surely, 2^6656413 is an apocalyptic number.

It is an amenable number.

6656413 is a deficient number, since it is larger than the sum of its proper divisors (214755).

6656413 is a wasteful number, since it uses less digits than its factorization.

6656413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214754.

The product of its digits is 12960, while the sum is 31.

The square root of 6656413 is about 2580.0025193786. The cubic root of 6656413 is about 188.1106655671.

The spelling of 6656413 in words is "six million, six hundred fifty-six thousand, four hundred thirteen".