6440641106 has 8 divisors (see below), whose sum is σ = 9769512060. Its totient is φ = 3184137088.

The previous prime is 6440641061. The next prime is 6440641157. The reversal of 6440641106 is 6011460446.

It can be written as a sum of positive squares in 2 ways, for example, as 6302930881 + 137710225 = 79391^2 + 11735^2 .

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, 18091511 + ... + 18091866.

Almost surely, 2^6440641106 is an apocalyptic number.

6440641106 is a deficient number, since it is larger than the sum of its proper divisors (3328870954).

6440641106 is a wasteful number, since it uses less digits than its factorization.

6440641106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36183468.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 6440641106 is about 80253.6049408374. The cubic root of 6440641106 is about 1860.5572294688.

The spelling of 6440641106 in words is "six billion, four hundred forty million, six hundred forty-one thousand, one hundred six".