7716256517 has 2 divisors, whose sum is σ = 7716256518. Its totient is φ = 7716256516.

The previous prime is 7716256487. The next prime is 7716256553. The reversal of 7716256517 is 7156526177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7123528801 + 592727716 = 84401^2 + 24346^2 .

It is an emirp because it is prime and its reverse (7156526177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7716256517 - 2¹⁶ = 7716190981 is a prime.

It is a super-2 number, since 2×7716256517² (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 (7716256817) 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, 3858128258 + 3858128259.

It is an arithmetic number, because the mean of its divisors is an integer number (3858128259).

Almost surely, 2^7716256517 is an apocalyptic number.

It is an amenable number.

7716256517 is a deficient number, since it is larger than the sum of its proper divisors (1).

7716256517 is an equidigital number, since it uses as much as digits as its factorization.

7716256517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 617400, while the sum is 47.

The square root of 7716256517 is about 87842.2251368896. The cubic root of 7716256517 is about 1976.0695177787.

The spelling of 7716256517 in words is "seven billion, seven hundred sixteen million, two hundred fifty-six thousand, five hundred seventeen".