6891159568 has 20 divisors (see below), whose sum is σ = 13812023340. Its totient is φ = 3326766464.

The previous prime is 6891159563. The next prime is 6891159581. The reversal of 6891159568 is 8659511986.

It can be written as a sum of positive squares in 2 ways, for example, as 2219163664 + 4671995904 = 47108^2 + 68352^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is not an unprimeable number, because it can be changed into a prime (6891159563) 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, 7425355 + ... + 7426282.

It is an arithmetic number, because the mean of its divisors is an integer number (690601167).

Almost surely, 2^6891159568 is an apocalyptic number.

It is an amenable number.

6891159568 is an abundant number, since it is smaller than the sum of its proper divisors (6920863772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6891159568 is a wasteful number, since it uses less digits than its factorization.

6891159568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14851674 (or 14851668 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 58.

The square root of 6891159568 is about 83013.0084263906. The cubic root of 6891159568 is about 1902.9648602658.

The spelling of 6891159568 in words is "six billion, eight hundred ninety-one million, one hundred fifty-nine thousand, five hundred sixty-eight".