6544008985 has 8 divisors (see below), whose sum is σ = 8314740936. Its totient is φ = 4927253760.

The previous prime is 6544008983. The next prime is 6544008997. The reversal of 6544008985 is 5898004456.

It can be written as a sum of positive squares in 4 ways, for example, as 2657608704 + 3886400281 = 51552^2 + 62341^2 .

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

It is not a de Polignac number, because 6544008985 - 2¹ = 6544008983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6544008983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38494086 + ... + 38494255.

It is an arithmetic number, because the mean of its divisors is an integer number (1039342617).

Almost surely, 2^6544008985 is an apocalyptic number.

It is an amenable number.

6544008985 is a deficient number, since it is larger than the sum of its proper divisors (1770731951).

6544008985 is a wasteful number, since it uses less digits than its factorization.

6544008985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76988363.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The square root of 6544008985 is about 80895.0491995647. The cubic root of 6544008985 is about 1870.4580064338.

The spelling of 6544008985 in words is "six billion, five hundred forty-four million, eight thousand, nine hundred eighty-five".