10000443056561 has 4 divisors (see below), whose sum is σ = 10000449982500. Its totient is φ = 10000436130624.

The previous prime is 10000443056497. The next prime is 10000443056567. The reversal of 10000443056561 is 16565034400001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3760713833536 + 6239729223025 = 1939256^2 + 2497945^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000443056561 - 2⁶ = 10000443056497 is a prime.

It is a super-2 number, since 2×10000443056561² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10000443056567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385436 + ... + 4488813.

It is an arithmetic number, because the mean of its divisors is an integer number (2500112495625).

Almost surely, 2^{10000443056561} is an apocalyptic number.

It is an amenable number.

10000443056561 is a deficient number, since it is larger than the sum of its proper divisors (6925939).

10000443056561 is an equidigital number, since it uses as much as digits as its factorization.

10000443056561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925938.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 10000443056561 its reverse (16565034400001), we get a palindrome (26565477456562).

The spelling of 10000443056561 in words is "ten trillion, four hundred forty-three million, fifty-six thousand, five hundred sixty-one".