666000999999 has 48 divisors (see below), whose sum is σ = 1000306417344. Its totient is φ = 426653568000.

The previous prime is 666000999997. The next prime is 666001000001. The reversal of 666000999999 is 999999000666.

It is an interprime number because it is at equal distance from previous prime (666000999997) and next prime (666001000001).

It is not a de Polignac number, because 666000999999 - 2¹ = 666000999997 is a prime.

666000999999 is a modest number, since divided by 999999 gives 666000 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 (666000999997) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8660679 + ... + 8737239.

It is an arithmetic number, because the mean of its divisors is an integer number (20839717028).

Almost surely, 2^666000999999 is an apocalyptic number.

666000999999 is a deficient number, since it is larger than the sum of its proper divisors (334305417345).

666000999999 is a wasteful number, since it uses less digits than its factorization.

666000999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76928 (or 76925 counting only the distinct ones).

The product of its (nonzero) digits is 114791256, while the sum is 72.

The spelling of 666000999999 in words is "six hundred sixty-six billion, nine hundred ninety-nine thousand, nine hundred ninety-nine".