1006520666 has 8 divisors (see below), whose sum is σ = 1598591700. Its totient is φ = 473656768.

The previous prime is 1006520663. The next prime is 1006520701. The reversal of 1006520666 is 6660256001.

It can be written as a sum of positive squares in 2 ways, for example, as 895745041 + 110775625 = 29929^2 + 10525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1006520663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14801741 + ... + 14801808.

Almost surely, 2^1006520666 is an apocalyptic number.

1006520666 is a deficient number, since it is larger than the sum of its proper divisors (592071034).

1006520666 is a wasteful number, since it uses less digits than its factorization.

1006520666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29603568.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1006520666 is about 31725.7098580946. The cubic root of 1006520666 is about 1002.1688480309.

Adding to 1006520666 its reverse (6660256001), we get a palindrome (7666776667).

The spelling of 1006520666 in words is "one billion, six million, five hundred twenty thousand, six hundred sixty-six".