6511720711 has 4 divisors (see below), whose sum is σ = 6569346672. Its totient is φ = 6454094752.

The previous prime is 6511720651. The next prime is 6511720723. The reversal of 6511720711 is 1170271156.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6511720711 - 2⁷ = 6511720583 is a prime.

It is a super-3 number, since 3×6511720711³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6511720771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28812811 + ... + 28813036.

It is an arithmetic number, because the mean of its divisors is an integer number (1642336668).

Almost surely, 2^6511720711 is an apocalyptic number.

6511720711 is a deficient number, since it is larger than the sum of its proper divisors (57625961).

6511720711 is a wasteful number, since it uses less digits than its factorization.

6511720711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57625960.

The product of its (nonzero) digits is 2940, while the sum is 31.

The square root of 6511720711 is about 80695.2335085537. The cubic root of 6511720711 is about 1867.3766403524.

Adding to 6511720711 its reverse (1170271156), we get a palindrome (7681991867).

The spelling of 6511720711 in words is "six billion, five hundred eleven million, seven hundred twenty thousand, seven hundred eleven".