6640952913 has 80 divisors (see below), whose sum is σ = 12122922240. Its totient is φ = 3536400384.

The previous prime is 6640952911. The next prime is 6640952921. The reversal of 6640952913 is 3192590466.

It is not a de Polignac number, because 6640952913 - 2¹ = 6640952911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6640952911) 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 79 ways as a sum of consecutive naturals, for example, 989473 + ... + 996161.

It is an arithmetic number, because the mean of its divisors is an integer number (151536528).

Almost surely, 2^6640952913 is an apocalyptic number.

6640952913 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

6640952913 is a deficient number, since it is larger than the sum of its proper divisors (5481969327).

6640952913 is a wasteful number, since it uses less digits than its factorization.

6640952913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6828 (or 6819 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 6640952913 is about 81492.0420225190. The cubic root of 6640952913 is about 1879.6491831631.

The spelling of 6640952913 in words is "six billion, six hundred forty million, nine hundred fifty-two thousand, nine hundred thirteen".