6617656709 has 4 divisors (see below), whose sum is σ = 6643406604. Its totient is φ = 6591906816.

The previous prime is 6617656697. The next prime is 6617656751. The reversal of 6617656709 is 9076567166.

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 6552902500 + 64754209 = 80950^2 + 8047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6617656709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6617656009) 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, 12874562 + ... + 12875075.

It is an arithmetic number, because the mean of its divisors is an integer number (1660851651).

Almost surely, 2^6617656709 is an apocalyptic number.

It is an amenable number.

6617656709 is a deficient number, since it is larger than the sum of its proper divisors (25749895).

6617656709 is a wasteful number, since it uses less digits than its factorization.

6617656709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25749894.

The product of its (nonzero) digits is 2857680, while the sum is 53.

The square root of 6617656709 is about 81348.9809954618. The cubic root of 6617656709 is about 1877.4486960531.

The spelling of 6617656709 in words is "six billion, six hundred seventeen million, six hundred fifty-six thousand, seven hundred nine".