1666104456239 has 4 divisors (see below), whose sum is σ = 1667275297056. Its totient is φ = 1664933615424.

The previous prime is 1666104456217. The next prime is 1666104456251. The reversal of 1666104456239 is 9326544016661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666104456239 - 2¹⁶ = 1666104390703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666104456139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 585418274 + ... + 585421119.

It is an arithmetic number, because the mean of its divisors is an integer number (416818824264).

Almost surely, 2^{1666104456239} is an apocalyptic number.

1666104456239 is a deficient number, since it is larger than the sum of its proper divisors (1170840817).

1666104456239 is a wasteful number, since it uses less digits than its factorization.

1666104456239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170840816.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 1666104456239 in words is "one trillion, six hundred sixty-six billion, one hundred four million, four hundred fifty-six thousand, two hundred thirty-nine".