6640379229 has 32 divisors (see below), whose sum is σ = 9992481408. Its totient is φ = 3887360000.

The previous prime is 6640379219. The next prime is 6640379261. The reversal of 6640379229 is 9229730466.

It is a cyclic number.

It is not a de Polignac number, because 6640379229 - 2²³ = 6631990621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640379209) 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 31 ways as a sum of consecutive naturals, for example, 112357 + ... + 160949.

It is an arithmetic number, because the mean of its divisors is an integer number (312265044).

Almost surely, 2^6640379229 is an apocalyptic number.

It is an amenable number.

6640379229 is a deficient number, since it is larger than the sum of its proper divisors (3352102179).

6640379229 is a wasteful number, since it uses less digits than its factorization.

6640379229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48749.

The product of its (nonzero) digits is 979776, while the sum is 48.

The square root of 6640379229 is about 81488.5220690620. The cubic root of 6640379229 is about 1879.5950566078.

The spelling of 6640379229 in words is "six billion, six hundred forty million, three hundred seventy-nine thousand, two hundred twenty-nine".