1665706406133 has 32 divisors (see below), whose sum is σ = 2769117990912. Its totient is φ = 865254686400.

The previous prime is 1665706406017. The next prime is 1665706406137. The reversal of 1665706406133 is 3316046075661.

It is not a de Polignac number, because 1665706406133 - 2³² = 1661411438837 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665706406137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4250548 + ... + 4625858.

It is an arithmetic number, because the mean of its divisors is an integer number (86534937216).

Almost surely, 2^{1665706406133} is an apocalyptic number.

It is an amenable number.

1665706406133 is a deficient number, since it is larger than the sum of its proper divisors (1103411584779).

1665706406133 is a wasteful number, since it uses less digits than its factorization.

1665706406133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394545.

The product of its (nonzero) digits is 1632960, while the sum is 48.

The spelling of 1665706406133 in words is "one trillion, six hundred sixty-five billion, seven hundred six million, four hundred six thousand, one hundred thirty-three".