1666106020 has 12 divisors (see below), whose sum is σ = 3498822684. Its totient is φ = 666442400.

The previous prime is 1666106017. The next prime is 1666106033. The reversal of 1666106020 is 206016661.

It can be written as a sum of positive squares in 2 ways, for example, as 345365056 + 1320740964 = 18584^2 + 36342^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1666106020.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41652631 + ... + 41652670.

It is an arithmetic number, because the mean of its divisors is an integer number (291568557).

Almost surely, 2^1666106020 is an apocalyptic number.

1666106020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666106020 is an abundant number, since it is smaller than the sum of its proper divisors (1832716664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666106020 is a wasteful number, since it uses less digits than its factorization.

1666106020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83305310 (or 83305308 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1666106020 is about 40817.9619775412. The cubic root of 1666106020 is about 1185.4981425620.

The spelling of 1666106020 in words is "one billion, six hundred sixty-six million, one hundred six thousand, twenty".