1543411666221 has 16 divisors (see below), whose sum is σ = 2219025762240. Its totient is φ = 951011038080.

The previous prime is 1543411666141. The next prime is 1543411666267. The reversal of 1543411666221 is 1226661143451.

It is not a de Polignac number, because 1543411666221 - 2¹¹ = 1543411664173 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1543411666921) 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, 330209830 + ... + 330214503.

It is an arithmetic number, because the mean of its divisors is an integer number (138689110140).

Almost surely, 2^{1543411666221} is an apocalyptic number.

It is an amenable number.

1543411666221 is a deficient number, since it is larger than the sum of its proper divisors (675614096019).

1543411666221 is a wasteful number, since it uses less digits than its factorization.

1543411666221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660424396.

The product of its digits is 207360, while the sum is 42.

The spelling of 1543411666221 in words is "one trillion, five hundred forty-three billion, four hundred eleven million, six hundred sixty-six thousand, two hundred twenty-one".