1666668350185 has 16 divisors (see below), whose sum is σ = 2038656114000. Its totient is φ = 1307587956480.

The previous prime is 1666668350183. The next prime is 1666668350201. The reversal of 1666668350185 is 5810538666661.

It can be written as a sum of positive squares in 8 ways, for example, as 257433449641 + 1409234900544 = 507379^2 + 1187112^2 .

It is not a de Polignac number, because 1666668350185 - 2¹ = 1666668350183 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666668350183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 827310 + ... + 2004439.

It is an arithmetic number, because the mean of its divisors is an integer number (127416007125).

Almost surely, 2^{1666668350185} is an apocalyptic number.

It is an amenable number.

1666668350185 is a deficient number, since it is larger than the sum of its proper divisors (371987763815).

1666668350185 is a wasteful number, since it uses less digits than its factorization.

1666668350185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834028.

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

The spelling of 1666668350185 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-eight million, three hundred fifty thousand, one hundred eighty-five".