6541718805 has 24 divisors (see below), whose sum is σ = 11341354752. Its totient is φ = 3488185824.

The previous prime is 6541718801. The next prime is 6541718837. The reversal of 6541718805 is 5088171456.

It is not a de Polignac number, because 6541718805 - 2² = 6541718801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541718801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254452 + ... + 278978.

It is an arithmetic number, because the mean of its divisors is an integer number (472556448).

Almost surely, 2^6541718805 is an apocalyptic number.

It is an amenable number.

6541718805 is a deficient number, since it is larger than the sum of its proper divisors (4799635947).

6541718805 is a wasteful number, since it uses less digits than its factorization.

6541718805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30465 (or 30462 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 6541718805 is about 80880.8927064977. The cubic root of 6541718805 is about 1870.2397821343.

It can be divided in two parts, 654171 and 8805, that added together give a triangular number (662976 = T₁₁₅₁).

The spelling of 6541718805 in words is "six billion, five hundred forty-one million, seven hundred eighteen thousand, eight hundred five".