6891316815 has 16 divisors (see below), whose sum is σ = 11606428800. Its totient is φ = 3481928352.

The previous prime is 6891316813. The next prime is 6891316819. The reversal of 6891316815 is 5186131986.

It is not a de Polignac number, because 6891316815 - 2¹ = 6891316813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6891316813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12089745 + ... + 12090314.

It is an arithmetic number, because the mean of its divisors is an integer number (725401800).

Almost surely, 2^6891316815 is an apocalyptic number.

6891316815 is a deficient number, since it is larger than the sum of its proper divisors (4715111985).

6891316815 is a wasteful number, since it uses less digits than its factorization.

6891316815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24180086.

The product of its digits is 311040, while the sum is 48.

The square root of 6891316815 is about 83013.9555436313. The cubic root of 6891316815 is about 1902.9793345225.

The spelling of 6891316815 in words is "six billion, eight hundred ninety-one million, three hundred sixteen thousand, eight hundred fifteen".