6664509995 has 80 divisors (see below), whose sum is σ = 9740304000. Its totient is φ = 4349495040.

The previous prime is 6664509991. The next prime is 6664509997. The reversal of 6664509995 is 5999054666.

It is not a de Polignac number, because 6664509995 - 2² = 6664509991 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6664509991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 44728181 + ... + 44728329.

It is an arithmetic number, because the mean of its divisors is an integer number (121753800).

Almost surely, 2^6664509995 is an apocalyptic number.

6664509995 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

6664509995 is a deficient number, since it is larger than the sum of its proper divisors (3075794005).

6664509995 is a wasteful number, since it uses less digits than its factorization.

6664509995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 15746400, while the sum is 59.

The square root of 6664509995 is about 81636.4501616772. The cubic root of 6664509995 is about 1881.8690852992.

The spelling of 6664509995 in words is "six billion, six hundred sixty-four million, five hundred nine thousand, nine hundred ninety-five".