1666540538043 has 8 divisors (see below), whose sum is σ = 2339004264000. Its totient is φ = 1052551918728.

The previous prime is 1666540538009. The next prime is 1666540538063. The reversal of 1666540538043 is 3408350456661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1666540538043 - 2¹⁰ = 1666540537019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666540538063) 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 in 7 ways as a sum of consecutive naturals, for example, 14618776593 + ... + 14618776706.

It is an arithmetic number, because the mean of its divisors is an integer number (292375533000).

Almost surely, 2^{1666540538043} is an apocalyptic number.

1666540538043 is a deficient number, since it is larger than the sum of its proper divisors (672463725957).

1666540538043 is a wasteful number, since it uses less digits than its factorization.

1666540538043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29237553321.

The product of its (nonzero) digits is 6220800, while the sum is 51.

The spelling of 1666540538043 in words is "one trillion, six hundred sixty-six billion, five hundred forty million, five hundred thirty-eight thousand, forty-three".