10656561 has 8 divisors (see below), whose sum is σ = 14539360. Its totient is φ = 6939072.

The previous prime is 10656557. The next prime is 10656577. The reversal of 10656561 is 16565601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10656561 - 2² = 10656557 is a prime.

It is a super-2 number, since 2×10656561² = 227124584693442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10656361) 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 7 ways as a sum of consecutive naturals, for example, 41176 + ... + 41433.

It is an arithmetic number, because the mean of its divisors is an integer number (1817420).

Almost surely, 2^10656561 is an apocalyptic number.

It is an amenable number.

10656561 is a deficient number, since it is larger than the sum of its proper divisors (3882799).

10656561 is an equidigital number, since it uses as much as digits as its factorization.

10656561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82655.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 10656561 is about 3264.4388491745. The cubic root of 10656561 is about 220.0589442608.

It can be divided in two parts, 1065 and 6561, that added together give a triangular number (7626 = T₁₂₃).

The spelling of 10656561 in words is "ten million, six hundred fifty-six thousand, five hundred sixty-one".