6660099999 has 12 divisors (see below), whose sum is σ = 10994450896. Its totient is φ = 3805771392.

The previous prime is 6660099997. The next prime is 6660100019. The reversal of 6660099999 is 9999900666.

It is not a de Polignac number, because 6660099999 - 2¹ = 6660099997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 105715873 = 6660099999 / (6 + 6 + 6 + 0 + 0 + 9 + 9 + 9 + 9 + 9).

It is a Duffinian number.

6660099999 is a modest number, since divided by 99999 gives 66600 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 (6660099991) 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, 52857874 + ... + 52857999.

Almost surely, 2^6660099999 is an apocalyptic number.

6660099999 is a deficient number, since it is larger than the sum of its proper divisors (4334350897).

6660099999 is a wasteful number, since it uses less digits than its factorization.

6660099999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105715886 (or 105715883 counting only the distinct ones).

The product of its (nonzero) digits is 12754584, while the sum is 63.

The square root of 6660099999 is about 81609.4357228378. The cubic root of 6660099999 is about 1881.4539076719.

The spelling of 6660099999 in words is "six billion, six hundred sixty million, ninety-nine thousand, nine hundred ninety-nine".