6640004131 has 2 divisors, whose sum is σ = 6640004132. Its totient is φ = 6640004130.

The previous prime is 6640004099. The next prime is 6640004183. The reversal of 6640004131 is 1314000466.

6640004131 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6640004131 - 2⁵ = 6640004099 is a prime.

It is a super-2 number, since 2×6640004131² = 88179309719394130322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6640004096 and 6640004105.

It is not a weakly prime, because it can be changed into another prime (6640004191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3320002065 + 3320002066.

It is an arithmetic number, because the mean of its divisors is an integer number (3320002066).

Almost surely, 2^6640004131 is an apocalyptic number.

6640004131 is a deficient number, since it is larger than the sum of its proper divisors (1).

6640004131 is an equidigital number, since it uses as much as digits as its factorization.

6640004131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 6640004131 is about 81486.2204977013. The cubic root of 6640004131 is about 1879.5596647726.

Adding to 6640004131 its reverse (1314000466), we get a palindrome (7954004597).

The spelling of 6640004131 in words is "six billion, six hundred forty million, four thousand, one hundred thirty-one".