1666685016835 has 16 divisors (see below), whose sum is σ = 2003518363392. Its totient is φ = 1331018488800.

The previous prime is 1666685016803. The next prime is 1666685016859. The reversal of 1666685016835 is 5386105866661.

It is not a de Polignac number, because 1666685016835 - 2⁵ = 1666685016803 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9843240 + ... + 10011130.

It is an arithmetic number, because the mean of its divisors is an integer number (125219897712).

Almost surely, 2^{1666685016835} is an apocalyptic number.

1666685016835 is a deficient number, since it is larger than the sum of its proper divisors (336833346557).

1666685016835 is a wasteful number, since it uses less digits than its factorization.

1666685016835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171354.

The product of its (nonzero) digits is 37324800, while the sum is 61.

The spelling of 1666685016835 in words is "one trillion, six hundred sixty-six billion, six hundred eighty-five million, sixteen thousand, eight hundred thirty-five".