8040808781 has 2 divisors, whose sum is σ = 8040808782. Its totient is φ = 8040808780.

The previous prime is 8040808777. The next prime is 8040808813. The reversal of 8040808781 is 1878080408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6877384900 + 1163423881 = 82930^2 + 34109^2 .

It is a cyclic number.

It is not a de Polignac number, because 8040808781 - 2² = 8040808777 is a prime.

It is a super-2 number, since 2×8040808781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8040808771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4020404390 + 4020404391.

It is an arithmetic number, because the mean of its divisors is an integer number (4020404391).

Almost surely, 2^8040808781 is an apocalyptic number.

It is an amenable number.

8040808781 is a deficient number, since it is larger than the sum of its proper divisors (1).

8040808781 is an equidigital number, since it uses as much as digits as its factorization.

8040808781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 114688, while the sum is 44.

The square root of 8040808781 is about 89670.5569348156. The cubic root of 8040808781 is about 2003.3949655935.

The spelling of 8040808781 in words is "eight billion, forty million, eight hundred eight thousand, seven hundred eighty-one".