6640685211 has 8 divisors (see below), whose sum is σ = 8858368080. Its totient is φ = 4425062912.

The previous prime is 6640685209. The next prime is 6640685221. The reversal of 6640685211 is 1125860466.

It is a happy number.

6640685211 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6640685211 - 2¹ = 6640685209 is a prime.

It is a super-2 number, since 2×6640685211² = 88197400143188229042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6640685211.

It is not an unprimeable number, because it can be changed into a prime (6640685201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507606 + ... + 520523.

It is an arithmetic number, because the mean of its divisors is an integer number (1107296010).

Almost surely, 2^6640685211 is an apocalyptic number.

6640685211 is a deficient number, since it is larger than the sum of its proper divisors (2217682869).

6640685211 is a wasteful number, since it uses less digits than its factorization.

6640685211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030285.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 6640685211 is about 81490.3995020272. The cubic root of 6640685211 is about 1879.6239261147.

The spelling of 6640685211 in words is "six billion, six hundred forty million, six hundred eighty-five thousand, two hundred eleven".