6640637512 has 16 divisors (see below), whose sum is σ = 13183618860. Its totient is φ = 3125005824.

The previous prime is 6640637489. The next prime is 6640637593. The reversal of 6640637512 is 2157360466.

It can be written as a sum of positive squares in 2 ways, for example, as 6319296036 + 321341476 = 79494^2 + 17926^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24413973 + ... + 24414244.

Almost surely, 2^6640637512 is an apocalyptic number.

It is an amenable number.

6640637512 is a deficient number, since it is larger than the sum of its proper divisors (6542981348).

6640637512 is a wasteful number, since it uses less digits than its factorization.

6640637512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48828240 (or 48828236 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 6640637512 is about 81490.1068351245. The cubic root of 6640637512 is about 1879.6194257560.

Adding to 6640637512 its reverse (2157360466), we get a palindrome (8797997978).

The spelling of 6640637512 in words is "six billion, six hundred forty million, six hundred thirty-seven thousand, five hundred twelve".