7665555617 has 2 divisors, whose sum is σ = 7665555618. Its totient is φ = 7665555616.

The previous prime is 7665555533. The next prime is 7665555631. The reversal of 7665555617 is 7165555667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5651430976 + 2014124641 = 75176^2 + 44879^2 .

It is a cyclic number.

It is not a de Polignac number, because 7665555617 - 2¹⁶ = 7665490081 is a prime.

It is not a weakly prime, because it can be changed into another prime (7665555817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832777808 + 3832777809.

It is an arithmetic number, because the mean of its divisors is an integer number (3832777809).

Almost surely, 2^7665555617 is an apocalyptic number.

It is an amenable number.

7665555617 is a deficient number, since it is larger than the sum of its proper divisors (1).

7665555617 is an equidigital number, since it uses as much as digits as its factorization.

7665555617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6615000, while the sum is 53.

The square root of 7665555617 is about 87553.1588065217. The cubic root of 7665555617 is about 1971.7319765454.

The spelling of 7665555617 in words is "seven billion, six hundred sixty-five million, five hundred fifty-five thousand, six hundred seventeen".