6660000999 has 12 divisors (see below), whose sum is σ = 9880001976. Its totient is φ = 4320000432.

The previous prime is 6660000979. The next prime is 6660001013. The reversal of 6660000999 is 9990000666.

It is not a de Polignac number, because 6660000999 - 2²⁹ = 6123130087 is a prime.

It is a super-2 number, since 2×6660000999² = 88711226613361996002, which contains 22 as substring.

6660000999 is a strobogrammatic number because it is the same when read upside-down.

6660000999 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 (6660000959) 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, 9999669 + ... + 10000334.

It is an arithmetic number, because the mean of its divisors is an integer number (823333498).

Almost surely, 2^6660000999 is an apocalyptic number.

6660000999 is a deficient number, since it is larger than the sum of its proper divisors (3220000977).

6660000999 is a wasteful number, since it uses less digits than its factorization.

6660000999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20000046 (or 20000043 counting only the distinct ones).

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

The square root of 6660000999 is about 81608.8291730742. The cubic root of 6660000999 is about 1881.4445852463. Note that the first 3 decimals are identical.

The spelling of 6660000999 in words is "six billion, six hundred sixty million, nine hundred ninety-nine", and thus it is an aban number.