6641531313 has 16 divisors (see below), whose sum is σ = 9366979200. Its totient is φ = 4177160064.

The previous prime is 6641531297. The next prime is 6641531317. The reversal of 6641531313 is 3131351466.

It is not a de Polignac number, because 6641531313 - 2⁴ = 6641531297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6641531317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 654238 + ... + 664311.

It is an arithmetic number, because the mean of its divisors is an integer number (585436200).

Almost surely, 2^6641531313 is an apocalyptic number.

It is an amenable number.

6641531313 is a deficient number, since it is larger than the sum of its proper divisors (2725447887).

6641531313 is a wasteful number, since it uses less digits than its factorization.

6641531313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318648.

The product of its digits is 19440, while the sum is 33.

The square root of 6641531313 is about 81495.5907580281. The cubic root of 6641531313 is about 1879.7037515129.

Adding to 6641531313 its reverse (3131351466), we get a palindrome (9772882779).

The spelling of 6641531313 in words is "six billion, six hundred forty-one million, five hundred thirty-one thousand, three hundred thirteen".