56616561 has 24 divisors (see below), whose sum is σ = 87721920. Its totient is φ = 35077536.

The previous prime is 56616533. The next prime is 56616563. The reversal of 56616561 is 16561665.

It is not a de Polignac number, because 56616561 - 2⁷ = 56616433 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56616563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5940 + ... + 12186.

It is an arithmetic number, because the mean of its divisors is an integer number (3655080).

Almost surely, 2^56616561 is an apocalyptic number.

It is an amenable number.

56616561 is a deficient number, since it is larger than the sum of its proper divisors (31105359).

56616561 is a wasteful number, since it uses less digits than its factorization.

56616561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325 (or 6322 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 56616561 is about 7524.3977167611. The cubic root of 56616561 is about 383.9852085774.

The spelling of 56616561 in words is "fifty-six million, six hundred sixteen thousand, five hundred sixty-one".