6640851 has 24 divisors (see below), whose sum is σ = 10550272. Its totient is φ = 3636000.

The previous prime is 6640849. The next prime is 6640889. The reversal of 6640851 is 1580466.

It is not a de Polignac number, because 6640851 - 2¹ = 6640849 is a prime.

It is a Duffinian number.

6640851 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640831) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65701 + ... + 65801.

Almost surely, 2^6640851 is an apocalyptic number.

6640851 is a deficient number, since it is larger than the sum of its proper divisors (3909421).

6640851 is a wasteful number, since it uses less digits than its factorization.

6640851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 6640851 is about 2576.9848660790. The cubic root of 6640851 is about 187.9639567993.

The spelling of 6640851 in words is "six million, six hundred forty thousand, eight hundred fifty-one".