9987764569 has 2 divisors, whose sum is σ = 9987764570. Its totient is φ = 9987764568.

The previous prime is 9987764477. The next prime is 9987764603. The reversal of 9987764569 is 9654677899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8781938944 + 1205825625 = 93712^2 + 34725^2 .

It is a cyclic number.

It is not a de Polignac number, because 9987764569 - 2³³ = 1397829977 is a prime.

It is a super-2 number, since 2×9987764569² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9987764498 and 9987764507.

It is not a weakly prime, because it can be changed into another prime (9987764669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4993882284 + 4993882285.

It is an arithmetic number, because the mean of its divisors is an integer number (4993882285).

Almost surely, 2^9987764569 is an apocalyptic number.

It is an amenable number.

9987764569 is a deficient number, since it is larger than the sum of its proper divisors (1).

9987764569 is an equidigital number, since it uses as much as digits as its factorization.

9987764569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 205752960, while the sum is 70.

The square root of 9987764569 is about 99938.8041203216. The cubic root of 9987764569 is about 2153.5556501868. Note that the first 3 decimals are identical.

The spelling of 9987764569 in words is "nine billion, nine hundred eighty-seven million, seven hundred sixty-four thousand, five hundred sixty-nine".