10561138843391 has 4 divisors (see below), whose sum is σ = 10580099595912. Its totient is φ = 10542178090872.

The previous prime is 10561138843351. The next prime is 10561138843403. The reversal of 10561138843391 is 19334883116501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10561138843391 is a prime.

It is a super-2 number, since 2×10561138843391² (a number of 27 digits) 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 (10561138843351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9480375425 + ... + 9480376538.

It is an arithmetic number, because the mean of its divisors is an integer number (2645024898978).

Almost surely, 2^{10561138843391} is an apocalyptic number.

10561138843391 is a deficient number, since it is larger than the sum of its proper divisors (18960752521).

10561138843391 is an equidigital number, since it uses as much as digits as its factorization.

10561138843391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18960752520.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 10561138843391 in words is "ten trillion, five hundred sixty-one billion, one hundred thirty-eight million, eight hundred forty-three thousand, three hundred ninety-one".