6561716 has 36 divisors (see below), whose sum is σ = 13749792. Its totient is φ = 2683824.

The previous prime is 6561697. The next prime is 6561719. The reversal of 6561716 is 6171656.

It is a super-2 number, since 2×6561716² = 86112233729312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14591 + ... + 15033.

Almost surely, 2^6561716 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6561716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6874896).

6561716 is an abundant number, since it is smaller than the sum of its proper divisors (7188076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6561716 is a wasteful number, since it uses less digits than its factorization.

6561716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500 (or 475 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 6561716 is about 2561.5846657880. The cubic root of 6561716 is about 187.2143537950.

The spelling of 6561716 in words is "six million, five hundred sixty-one thousand, seven hundred sixteen".