6698788081 has 2 divisors, whose sum is σ = 6698788082. Its totient is φ = 6698788080.

The previous prime is 6698788073. The next prime is 6698788091. The reversal of 6698788081 is 1808878966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6339344400 + 359443681 = 79620^2 + 18959^2 .

It is a cyclic number.

It is not a de Polignac number, because 6698788081 - 2³ = 6698788073 is a prime.

It is a super-2 number, since 2×6698788081² = 89747523508295325122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6698788091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3349394040 + 3349394041.

It is an arithmetic number, because the mean of its divisors is an integer number (3349394041).

Almost surely, 2^6698788081 is an apocalyptic number.

It is an amenable number.

6698788081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6698788081 is an equidigital number, since it uses as much as digits as its factorization.

6698788081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9289728, while the sum is 61.

The square root of 6698788081 is about 81846.1244103837. The cubic root of 6698788081 is about 1885.0899567987.

The spelling of 6698788081 in words is "six billion, six hundred ninety-eight million, seven hundred eighty-eight thousand, eighty-one".