7720377641 has 2 divisors, whose sum is σ = 7720377642. Its totient is φ = 7720377640.

The previous prime is 7720377611. The next prime is 7720377649. The reversal of 7720377641 is 1467730277.

It is a happy number.

7720377641 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5129567641 + 2590810000 = 71621^2 + 50900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7720377641 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7720377592 and 7720377601.

It is not a weakly prime, because it can be changed into another prime (7720377649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860188820 + 3860188821.

It is an arithmetic number, because the mean of its divisors is an integer number (3860188821).

Almost surely, 2^7720377641 is an apocalyptic number.

It is an amenable number.

7720377641 is a deficient number, since it is larger than the sum of its proper divisors (1).

7720377641 is an equidigital number, since it uses as much as digits as its factorization.

7720377641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345744, while the sum is 44.

The square root of 7720377641 is about 87865.6795398522. The cubic root of 7720377641 is about 1976.4212504328.

The spelling of 7720377641 in words is "seven billion, seven hundred twenty million, three hundred seventy-seven thousand, six hundred forty-one".