1666606105 has 16 divisors (see below), whose sum is σ = 2088685440. Its totient is φ = 1274213248.

The previous prime is 1666606103. The next prime is 1666606111. The reversal of 1666606105 is 5016066661.

It is not a de Polignac number, because 1666606105 - 2¹ = 1666606103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1666606103) 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, 142614 + ... + 153856.

It is an arithmetic number, because the mean of its divisors is an integer number (130542840).

Almost surely, 2^1666606105 is an apocalyptic number.

It is an amenable number.

1666606105 is a deficient number, since it is larger than the sum of its proper divisors (422079335).

1666606105 is a wasteful number, since it uses less digits than its factorization.

1666606105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12560.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1666606105 is about 40824.0873137416. The cubic root of 1666606105 is about 1185.6167405636.

The spelling of 1666606105 in words is "one billion, six hundred sixty-six million, six hundred six thousand, one hundred five".