6640442266 has 8 divisors (see below), whose sum is σ = 9961692084. Its totient is φ = 3319878240.

The previous prime is 6640442251. The next prime is 6640442273. The reversal of 6640442266 is 6622440466.

6640442266 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 6612129225 + 28313041 = 81315^2 + 5321^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146515 + ... + 186406.

Almost surely, 2^6640442266 is an apocalyptic number.

6640442266 is a deficient number, since it is larger than the sum of its proper divisors (3321249818).

6640442266 is a wasteful number, since it uses less digits than its factorization.

6640442266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342896.

The product of its (nonzero) digits is 331776, while the sum is 40.

The square root of 6640442266 is about 81488.9088526776. The cubic root of 6640442266 is about 1879.6010042430.

The spelling of 6640442266 in words is "six billion, six hundred forty million, four hundred forty-two thousand, two hundred sixty-six".