666000999 has 12 divisors (see below), whose sum is σ = 988001976. Its totient is φ = 432000432.

The previous prime is 666000997. The next prime is 666001003. The reversal of 666000999 is 999000666.

It is not a de Polignac number, because 666000999 - 2¹ = 666000997 is a prime.

666000999 is a strobogrammatic number because it is the same when read upside-down.

666000999 is a modest number, since divided by 999 gives 666 as remainder.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666000997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 999669 + ... + 1000334.

It is an arithmetic number, because the mean of its divisors is an integer number (82333498).

Almost surely, 2^666000999 is an apocalyptic number.

666000999 is a deficient number, since it is larger than the sum of its proper divisors (322000977).

666000999 is a wasteful number, since it uses less digits than its factorization.

666000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000046 (or 2000043 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 666000999 is about 25806.9951563525. The cubic root of 666000999 is about 873.2896107740.

The spelling of 666000999 in words is "six hundred sixty-six million, nine hundred ninety-nine", and thus it is an aban number.