6640006845 has 8 divisors (see below), whose sum is σ = 10624010976. Its totient is φ = 3541336976.

The previous prime is 6640006843. The next prime is 6640006861. The reversal of 6640006845 is 5486000466.

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 6640006845 - 2¹ = 6640006843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640006843) 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, 221333547 + ... + 221333576.

It is an arithmetic number, because the mean of its divisors is an integer number (1328001372).

Almost surely, 2^6640006845 is an apocalyptic number.

It is an amenable number.

6640006845 is a deficient number, since it is larger than the sum of its proper divisors (3984004131).

6640006845 is a wasteful number, since it uses less digits than its factorization.

6640006845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442667131.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 6640006845 is about 81486.2371508220. The cubic root of 6640006845 is about 1879.5599208530.

The spelling of 6640006845 in words is "six billion, six hundred forty million, six thousand, eight hundred forty-five".