6544897805 has 4 divisors (see below), whose sum is σ = 7853877372. Its totient is φ = 5235918240.

The previous prime is 6544897787. The next prime is 6544897837. The reversal of 6544897805 is 5087984456.

It is a happy number.

6544897805 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1842641476 + 4702256329 = 42926^2 + 68573^2 .

It is not a de Polignac number, because 6544897805 - 2¹⁶ = 6544832269 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 654489776 + ... + 654489785.

It is an arithmetic number, because the mean of its divisors is an integer number (1963469343).

Almost surely, 2^6544897805 is an apocalyptic number.

It is an amenable number.

6544897805 is a deficient number, since it is larger than the sum of its proper divisors (1308979567).

6544897805 is a wasteful number, since it uses less digits than its factorization.

6544897805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308979566.

The product of its (nonzero) digits is 9676800, while the sum is 56.

The square root of 6544897805 is about 80900.5426743233. The cubic root of 6544897805 is about 1870.5426856789.

The spelling of 6544897805 in words is "six billion, five hundred forty-four million, eight hundred ninety-seven thousand, eight hundred five".