7725666517 has 2 divisors, whose sum is σ = 7725666518. Its totient is φ = 7725666516.

The previous prime is 7725666503. The next prime is 7725666521. The reversal of 7725666517 is 7156665277.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7521919441 + 203747076 = 86729^2 + 14274^2 .

It is a cyclic number.

It is not a de Polignac number, because 7725666517 - 2¹¹ = 7725664469 is a prime.

It is a super-2 number, since 2×7725666517² (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 (7725666527) 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, 3862833258 + 3862833259.

It is an arithmetic number, because the mean of its divisors is an integer number (3862833259).

Almost surely, 2^7725666517 is an apocalyptic number.

It is an amenable number.

7725666517 is a deficient number, since it is larger than the sum of its proper divisors (1).

7725666517 is an equidigital number, since it uses as much as digits as its factorization.

7725666517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3704400, while the sum is 52.

The square root of 7725666517 is about 87895.7707571872. The cubic root of 7725666517 is about 1976.8724658761.

The spelling of 7725666517 in words is "seven billion, seven hundred twenty-five million, six hundred sixty-six thousand, five hundred seventeen".