16543411434561 has 16 divisors (see below), whose sum is σ = 24118974885888. Its totient is φ = 10003047051600.

The previous prime is 16543411434533. The next prime is 16543411434577.

It is a happy number.

16543411434561 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16543411434561 - 2¹⁸ = 16543411172417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16543411434561.

It is not an unprimeable number, because it can be changed into a prime (16543411434961) 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 15 ways as a sum of consecutive naturals, for example, 581558281 + ... + 581586726.

It is an arithmetic number, because the mean of its divisors is an integer number (1507435930368).

Almost surely, 2^{16543411434561} is an apocalyptic number.

16543411434561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16543411434561 is a deficient number, since it is larger than the sum of its proper divisors (7575563451327).

16543411434561 is a wasteful number, since it uses less digits than its factorization.

16543411434561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163145452.

The product of its digits is 2073600, while the sum is 48.

The spelling of 16543411434561 in words is "sixteen trillion, five hundred forty-three billion, four hundred eleven million, four hundred thirty-four thousand, five hundred sixty-one".