7700776981 has 2 divisors, whose sum is σ = 7700776982. Its totient is φ = 7700776980.

The previous prime is 7700776961. The next prime is 7700777047. The reversal of 7700776981 is 1896770077.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6519755025 + 1181021956 = 80745^2 + 34366^2 .

It is a cyclic number.

It is not a de Polignac number, because 7700776981 - 2²³ = 7692388373 is a prime.

It is a super-2 number, since 2×7700776981² (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 (7700776961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3850388490 + 3850388491.

It is an arithmetic number, because the mean of its divisors is an integer number (3850388491).

Almost surely, 2^7700776981 is an apocalyptic number.

It is an amenable number.

7700776981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7700776981 is an equidigital number, since it uses as much as digits as its factorization.

7700776981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1037232, while the sum is 52.

The square root of 7700776981 is about 87754.0710223748. The cubic root of 7700776981 is about 1974.7472394364.

The spelling of 7700776981 in words is "seven billion, seven hundred million, seven hundred seventy-six thousand, nine hundred eighty-one".