1305005666 has 16 divisors (see below), whose sum is σ = 2011913856. Its totient is φ = 634544976.

The previous prime is 1305005659. The next prime is 1305005677. The reversal of 1305005666 is 6665005031.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29456 + ... + 58971.

It is an arithmetic number, because the mean of its divisors is an integer number (125744616).

Almost surely, 2^1305005666 is an apocalyptic number.

1305005666 is a deficient number, since it is larger than the sum of its proper divisors (706908190).

1305005666 is a wasteful number, since it uses less digits than its factorization.

1305005666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88633.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 1305005666 is about 36124.8621589066. The cubic root of 1305005666 is about 1092.7918961984.

The spelling of 1305005666 in words is "one billion, three hundred five million, five thousand, six hundred sixty-six".