6891336479 has 2 divisors, whose sum is σ = 6891336480. Its totient is φ = 6891336478.

The previous prime is 6891336451. The next prime is 6891336493. The reversal of 6891336479 is 9746331986.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6891336479 is a prime.

It is a super-2 number, since 2×6891336479² = 94981036933592234882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6891336379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3445668239 + 3445668240.

It is an arithmetic number, because the mean of its divisors is an integer number (3445668240).

Almost surely, 2^6891336479 is an apocalyptic number.

6891336479 is a deficient number, since it is larger than the sum of its proper divisors (1).

6891336479 is an equidigital number, since it uses as much as digits as its factorization.

6891336479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 56.

The square root of 6891336479 is about 83014.0739814641. The cubic root of 6891336479 is about 1902.9811445370.

The spelling of 6891336479 in words is "six billion, eight hundred ninety-one million, three hundred thirty-six thousand, four hundred seventy-nine".