6605999985 has 32 divisors (see below), whose sum is σ = 11396786688. Its totient is φ = 3248144640.

The previous prime is 6605999969. The next prime is 6605999989. The reversal of 6605999985 is 5899995066.

It is not a de Polignac number, because 6605999985 - 2⁴ = 6605999969 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6605999989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139464 + ... + 180726.

It is an arithmetic number, because the mean of its divisors is an integer number (356149584).

Almost surely, 2^6605999985 is an apocalyptic number.

6605999985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6605999985 is a deficient number, since it is larger than the sum of its proper divisors (4790786703).

6605999985 is a wasteful number, since it uses less digits than its factorization.

6605999985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42105.

The product of its (nonzero) digits is 47239200, while the sum is 66.

The square root of 6605999985 is about 81277.3030125877. The cubic root of 6605999985 is about 1876.3456991967.

The spelling of 6605999985 in words is "six billion, six hundred five million, nine hundred ninety-nine thousand, nine hundred eighty-five".