1000100666 has 4 divisors (see below), whose sum is σ = 1500151002. Its totient is φ = 500050332.

The previous prime is 1000100653. The next prime is 1000100677. The reversal of 1000100666 is 6660010001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 975250441 + 24850225 = 31229^2 + 4985^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250025165 + ... + 250025168.

Almost surely, 2^1000100666 is an apocalyptic number.

1000100666 is a deficient number, since it is larger than the sum of its proper divisors (500050336).

1000100666 is an equidigital number, since it uses as much as digits as its factorization.

1000100666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500050335.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1000100666 is about 31624.3682308438. The cubic root of 1000100666 is about 1000.0335542074.

Adding to 1000100666 its reverse (6660010001), we get a palindrome (7660110667).

The spelling of 1000100666 in words is "one billion, one hundred thousand, six hundred sixty-six".