6491678709 has 8 divisors (see below), whose sum is σ = 8784759520. Its totient is φ = 4263191856.

The previous prime is 6491678689. The next prime is 6491678717. The reversal of 6491678709 is 9078761946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6491678709 - 2¹² = 6491674613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491678729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16148254 + ... + 16148655.

It is an arithmetic number, because the mean of its divisors is an integer number (1098094940).

Almost surely, 2^6491678709 is an apocalyptic number.

It is an amenable number.

6491678709 is a deficient number, since it is larger than the sum of its proper divisors (2293080811).

6491678709 is a wasteful number, since it uses less digits than its factorization.

6491678709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32296979.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The square root of 6491678709 is about 80570.9544997451. The cubic root of 6491678709 is about 1865.4588457173.

The spelling of 6491678709 in words is "six billion, four hundred ninety-one million, six hundred seventy-eight thousand, seven hundred nine".