7905619681 has 2 divisors, whose sum is σ = 7905619682. Its totient is φ = 7905619680.

The previous prime is 7905619679. The next prime is 7905619699. The reversal of 7905619681 is 1869165097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5580837025 + 2324782656 = 74705^2 + 48216^2 .

It is a cyclic number.

It is not a de Polignac number, because 7905619681 - 2¹ = 7905619679 is a prime.

It is a super-2 number, since 2×7905619681² (a number of 21 digits) contains 22 as substring.

Together with 7905619679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7905619621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3952809840 + 3952809841.

It is an arithmetic number, because the mean of its divisors is an integer number (3952809841).

Almost surely, 2^7905619681 is an apocalyptic number.

It is an amenable number.

7905619681 is a deficient number, since it is larger than the sum of its proper divisors (1).

7905619681 is an equidigital number, since it uses as much as digits as its factorization.

7905619681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 7905619681 is about 88913.5517286313. The cubic root of 7905619681 is about 1992.1038397702.

The spelling of 7905619681 in words is "seven billion, nine hundred five million, six hundred nineteen thousand, six hundred eighty-one".