7987697569 has 2 divisors, whose sum is σ = 7987697570. Its totient is φ = 7987697568.

The previous prime is 7987697539. The next prime is 7987697687. The reversal of 7987697569 is 9657967897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7005690000 + 982007569 = 83700^2 + 31337^2 .

It is a cyclic number.

It is not a de Polignac number, because 7987697569 - 2⁷ = 7987697441 is a prime.

It is a super-2 number, since 2×7987697569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7987697519) 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, 3993848784 + 3993848785.

It is an arithmetic number, because the mean of its divisors is an integer number (3993848785).

Almost surely, 2^7987697569 is an apocalyptic number.

It is an amenable number.

7987697569 is a deficient number, since it is larger than the sum of its proper divisors (1).

7987697569 is an equidigital number, since it uses as much as digits as its factorization.

7987697569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360067680, while the sum is 73.

The square root of 7987697569 is about 89373.9199599078. The cubic root of 7987697569 is about 1998.9742714471.

The spelling of 7987697569 in words is "seven billion, nine hundred eighty-seven million, six hundred ninety-seven thousand, five hundred sixty-nine".