6889378081 has 4 divisors (see below), whose sum is σ = 6904322964. Its totient is φ = 6874433200.

The previous prime is 6889378063. The next prime is 6889378103. The reversal of 6889378081 is 1808739886.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1808739886 = 2 ⋅904369943.

It can be written as a sum of positive squares in 2 ways, for example, as 2003368081 + 4886010000 = 44759^2 + 69900^2 .

It is a cyclic number.

It is not a de Polignac number, because 6889378081 - 2¹¹ = 6889376033 is a prime.

It is a super-2 number, since 2×6889378081² = 94927060685926485122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6889378781) 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, 7471750 + ... + 7472671.

It is an arithmetic number, because the mean of its divisors is an integer number (1726080741).

Almost surely, 2^6889378081 is an apocalyptic number.

It is an amenable number.

6889378081 is a deficient number, since it is larger than the sum of its proper divisors (14944883).

6889378081 is a wasteful number, since it uses less digits than its factorization.

6889378081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14944882.

The product of its (nonzero) digits is 4644864, while the sum is 58.

The square root of 6889378081 is about 83002.2775651367. The cubic root of 6889378081 is about 1902.8008627410.

The spelling of 6889378081 in words is "six billion, eight hundred eighty-nine million, three hundred seventy-eight thousand, eighty-one".