6540440773 has 8 divisors (see below), whose sum is σ = 6639475392. Its totient is φ = 6441447936.

The previous prime is 6540440771. The next prime is 6540440807. The reversal of 6540440773 is 3770440456.

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

It is a cyclic number.

It is not a de Polignac number, because 6540440773 - 2¹ = 6540440771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540440771) 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 7 ways as a sum of consecutive naturals, for example, 470661 + ... + 484357.

It is an arithmetic number, because the mean of its divisors is an integer number (829934424).

Almost surely, 2^6540440773 is an apocalyptic number.

It is an amenable number.

6540440773 is a deficient number, since it is larger than the sum of its proper divisors (99034619).

6540440773 is a wasteful number, since it uses less digits than its factorization.

6540440773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20891.

The product of its (nonzero) digits is 282240, while the sum is 40.

The square root of 6540440773 is about 80872.9916164847. The cubic root of 6540440773 is about 1870.1179802026.

The spelling of 6540440773 in words is "six billion, five hundred forty million, four hundred forty thousand, seven hundred seventy-three".