6541664044 has 12 divisors (see below), whose sum is σ = 11451034504. Its totient is φ = 3269939904.

The previous prime is 6541663991. The next prime is 6541664083. The reversal of 6541664044 is 4404661456.

It is a junction number, because it is equal to n+sod(n) for n = 6541663988 and 6541664006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206394 + ... + 235969.

Almost surely, 2^6541664044 is an apocalyptic number.

It is an amenable number.

6541664044 is a deficient number, since it is larger than the sum of its proper divisors (4909370460).

6541664044 is a wasteful number, since it uses less digits than its factorization.

6541664044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446064 (or 446062 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

The square root of 6541664044 is about 80880.5541771321. The cubic root of 6541664044 is about 1870.2345635015.

The spelling of 6541664044 in words is "six billion, five hundred forty-one million, six hundred sixty-four thousand, forty-four".