6640444446 has 16 divisors (see below), whose sum is σ = 13338886800. Its totient is φ = 2203815168.

The previous prime is 6640444439. The next prime is 6640444457. The reversal of 6640444446 is 6444440466.

It is a junction number, because it is equal to n+sod(n) for n = 6640444398 and 6640444407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2415091 + ... + 2417838.

It is an arithmetic number, because the mean of its divisors is an integer number (833680425).

Almost surely, 2^6640444446 is an apocalyptic number.

6640444446 is an abundant number, since it is smaller than the sum of its proper divisors (6698442354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6640444446 is a wasteful number, since it uses less digits than its factorization.

6640444446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4833163.

The product of its (nonzero) digits is 884736, while the sum is 42.

The square root of 6640444446 is about 81488.9222287300. The cubic root of 6640444446 is about 1879.6012099285.

The spelling of 6640444446 in words is "six billion, six hundred forty million, four hundred forty-four thousand, four hundred forty-six".