6511117549 has 4 divisors (see below), whose sum is σ = 6516989820. Its totient is φ = 6505245280.

The previous prime is 6511117477. The next prime is 6511117567. The reversal of 6511117549 is 9457111156.

It is a happy number.

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 3294186025 + 3216931524 = 57395^2 + 56718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6511117549 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6511111549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2934472 + ... + 2936689.

It is an arithmetic number, because the mean of its divisors is an integer number (1629247455).

Almost surely, 2^6511117549 is an apocalyptic number.

It is an amenable number.

6511117549 is a deficient number, since it is larger than the sum of its proper divisors (5872271).

6511117549 is a wasteful number, since it uses less digits than its factorization.

6511117549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5872270.

The product of its digits is 37800, while the sum is 40.

The square root of 6511117549 is about 80691.4961380690. The cubic root of 6511117549 is about 1867.3189819926.

The spelling of 6511117549 in words is "six billion, five hundred eleven million, one hundred seventeen thousand, five hundred forty-nine".