6640788195 has 12 divisors (see below), whose sum is σ = 11510699616. Its totient is φ = 3541753680.

The previous prime is 6640788191. The next prime is 6640788199. The reversal of 6640788195 is 5918870466.

It is an interprime number because it is at equal distance from previous prime (6640788191) and next prime (6640788199).

It is not a de Polignac number, because 6640788195 - 2² = 6640788191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6640788191) 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 11 ways as a sum of consecutive naturals, for example, 73786491 + ... + 73786580.

It is an arithmetic number, because the mean of its divisors is an integer number (959224968).

Almost surely, 2^6640788195 is an apocalyptic number.

6640788195 is a deficient number, since it is larger than the sum of its proper divisors (4869911421).

6640788195 is a wasteful number, since it uses less digits than its factorization.

6640788195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147573082 (or 147573079 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 6640788195 is about 81491.0313776921. The cubic root of 6640788195 is about 1879.6336424910.

The spelling of 6640788195 in words is "six billion, six hundred forty million, seven hundred eighty-eight thousand, one hundred ninety-five".