6511655 has 4 divisors (see below), whose sum is σ = 7813992. Its totient is φ = 5209320.

The previous prime is 6511649. The next prime is 6511669. The reversal of 6511655 is 5561156.

6511655 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 6511655 - 2²⁰ = 5463079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651161 + ... + 651170.

It is an arithmetic number, because the mean of its divisors is an integer number (1953498).

Almost surely, 2^6511655 is an apocalyptic number.

6511655 is a deficient number, since it is larger than the sum of its proper divisors (1302337).

6511655 is a wasteful number, since it uses less digits than its factorization.

6511655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302336.

The product of its digits is 4500, while the sum is 29.

The square root of 6511655 is about 2551.7944666450. The cubic root of 6511655 is about 186.7370358982.

The spelling of 6511655 in words is "six million, five hundred eleven thousand, six hundred fifty-five".