6561916 has 12 divisors (see below), whose sum is σ = 12087880. Its totient is φ = 3108240.

The previous prime is 6561911. The next prime is 6561937. The reversal of 6561916 is 6191656.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561911) 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, 43095 + ... + 43246.

Almost surely, 2^6561916 is an apocalyptic number.

It is an amenable number.

6561916 is a deficient number, since it is larger than the sum of its proper divisors (5525964).

6561916 is a wasteful number, since it uses less digits than its factorization.

6561916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86364 (or 86362 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 6561916 is about 2561.6237038254. The cubic root of 6561916 is about 187.2162558630.

The spelling of 6561916 in words is "six million, five hundred sixty-one thousand, nine hundred sixteen".