8007782681 has 2 divisors, whose sum is σ = 8007782682. Its totient is φ = 8007782680.

The previous prime is 8007782659. The next prime is 8007782711. The reversal of 8007782681 is 1862877008.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7036525456 + 971257225 = 83884^2 + 31165^2 .

It is a cyclic number.

It is not a de Polignac number, because 8007782681 - 2²⁶ = 7940673817 is a prime.

It is a super-2 number, since 2×8007782681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8007782621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4003891340 + 4003891341.

It is an arithmetic number, because the mean of its divisors is an integer number (4003891341).

Almost surely, 2^8007782681 is an apocalyptic number.

It is an amenable number.

8007782681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8007782681 is an equidigital number, since it uses as much as digits as its factorization.

8007782681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 301056, while the sum is 47.

The square root of 8007782681 is about 89486.2150333782. The cubic root of 8007782681 is about 2000.6483465507.

The spelling of 8007782681 in words is "eight billion, seven million, seven hundred eighty-two thousand, six hundred eighty-one".