10556661 has 4 divisors (see below), whose sum is σ = 14075552. Its totient is φ = 7037772.

The previous prime is 10556659. The next prime is 10556669. The reversal of 10556661 is 16665501.

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.

It is not a de Polignac number, because 10556661 - 2¹ = 10556659 is a prime.

It is a super-2 number, since 2×10556661² = 222886182937842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10556669) 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 3 ways as a sum of consecutive naturals, for example, 1759441 + ... + 1759446.

It is an arithmetic number, because the mean of its divisors is an integer number (3518888).

Almost surely, 2^10556661 is an apocalyptic number.

It is an amenable number.

10556661 is a deficient number, since it is larger than the sum of its proper divisors (3518891).

10556661 is an equidigital number, since it uses as much as digits as its factorization.

10556661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3518890.

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

The square root of 10556661 is about 3249.1015681262. The cubic root of 10556661 is about 219.3691362139.

The spelling of 10556661 in words is "ten million, five hundred fifty-six thousand, six hundred sixty-one".