6640087113 has 18 divisors (see below), whose sum is σ = 10542435722. Its totient is φ = 4024294560.

The previous prime is 6640087021. The next prime is 6640087117. The reversal of 6640087113 is 3117800466.

6640087113 is a `hidden beast` number, since 6 + 640 + 0 + 8 + 7 + 1 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5765820489 + 874266624 = 75933^2 + 29568^2 .

It is not a de Polignac number, because 6640087113 - 2⁸ = 6640086857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6640087117) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3047620 + ... + 3049797.

Almost surely, 2^6640087113 is an apocalyptic number.

It is an amenable number.

6640087113 is a deficient number, since it is larger than the sum of its proper divisors (3902348609).

6640087113 is a wasteful number, since it uses less digits than its factorization.

6640087113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6097445 (or 6097431 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 6640087113 is about 81486.7296742236. The cubic root of 6640087113 is about 1879.5674945353.

Adding to 6640087113 its reverse (3117800466), we get a palindrome (9757887579).

The spelling of 6640087113 in words is "six billion, six hundred forty million, eighty-seven thousand, one hundred thirteen".