1666666850185 has 16 divisors (see below), whose sum is σ = 2143360993536. Its totient is φ = 1240893200448.

The previous prime is 1666666850171. The next prime is 1666666850197. The reversal of 1666666850185 is 5810586666661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666666850185 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, 195843789 + ... + 195852298.

It is an arithmetic number, because the mean of its divisors is an integer number (133960062096).

Almost surely, 2^{1666666850185} is an apocalyptic number.

It is an amenable number.

1666666850185 is a deficient number, since it is larger than the sum of its proper divisors (476694143351).

1666666850185 is a wasteful number, since it uses less digits than its factorization.

1666666850185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391696152.

The product of its (nonzero) digits is 74649600, while the sum is 64.

The spelling of 1666666850185 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-six million, eight hundred fifty thousand, one hundred eighty-five".