10000661543 has 2 divisors, whose sum is σ = 10000661544. Its totient is φ = 10000661542.

The previous prime is 10000661537. The next prime is 10000661591. The reversal of 10000661543 is 34516600001.

10000661543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10000661543 - 2²⁰ = 9999612967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10000664543) 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 as a sum of consecutive naturals, namely, 5000330771 + 5000330772.

It is an arithmetic number, because the mean of its divisors is an integer number (5000330772).

Almost surely, 2^10000661543 is an apocalyptic number.

10000661543 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000661543 is an equidigital number, since it uses as much as digits as its factorization.

10000661543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 10000661543 in words is "ten billion, six hundred sixty-one thousand, five hundred forty-three".