6540520811 has 6 divisors (see below), whose sum is σ = 7189167636. Its totient is φ = 5945927900.

The previous prime is 6540520807. The next prime is 6540520813. The reversal of 6540520811 is 1180250456.

It is not a de Polignac number, because 6540520811 - 2² = 6540520807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6540520813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27026825 + ... + 27027066.

It is an arithmetic number, because the mean of its divisors is an integer number (1198194606).

Almost surely, 2^6540520811 is an apocalyptic number.

6540520811 is a deficient number, since it is larger than the sum of its proper divisors (648646825).

6540520811 is a wasteful number, since it uses less digits than its factorization.

6540520811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54053913 (or 54053902 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 6540520811 is about 80873.4864526070. The cubic root of 6540520811 is about 1870.1256086330.

The spelling of 6540520811 in words is "six billion, five hundred forty million, five hundred twenty thousand, eight hundred eleven".