6709509509 has 4 divisors (see below), whose sum is σ = 6735021216. Its totient is φ = 6683997804.

The previous prime is 6709509491. The next prime is 6709509517. The reversal of 6709509509 is 9059059076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6709509509 is a prime.

It is a super-2 number, since 2×6709509509² = 90035035702722842162, which contains 22 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 (6709509409) 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, 12755459 + ... + 12755984.

It is an arithmetic number, because the mean of its divisors is an integer number (1683755304).

Almost surely, 2^6709509509 is an apocalyptic number.

It is an amenable number.

6709509509 is a deficient number, since it is larger than the sum of its proper divisors (25511707).

6709509509 is a wasteful number, since it uses less digits than its factorization.

6709509509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25511706.

The product of its (nonzero) digits is 765450, while the sum is 50.

The square root of 6709509509 is about 81911.5956931618. The cubic root of 6709509509 is about 1886.0951178849.

The spelling of 6709509509 in words is "six billion, seven hundred nine million, five hundred nine thousand, five hundred nine".