1666005506 has 16 divisors (see below), whose sum is σ = 2844721728. Its totient is φ = 724350000.

The previous prime is 1666005487. The next prime is 1666005553. The reversal of 1666005506 is 6055006661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1645745 + ... + 1646756.

It is an arithmetic number, because the mean of its divisors is an integer number (177795108).

Almost surely, 2^1666005506 is an apocalyptic number.

1666005506 is a deficient number, since it is larger than the sum of its proper divisors (1178716222).

1666005506 is a wasteful number, since it uses less digits than its factorization.

1666005506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292537.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1666005506 is about 40816.7307118049. The cubic root of 1666005506 is about 1185.4743022311.

The spelling of 1666005506 in words is "one billion, six hundred sixty-six million, five thousand, five hundred six".