8799779917 has 2 divisors, whose sum is σ = 8799779918. Its totient is φ = 8799779916.

The previous prime is 8799779843. The next prime is 8799779929. The reversal of 8799779917 is 7199779978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7031493316 + 1768286601 = 83854^2 + 42051^2 .

It is a cyclic number.

It is not a de Polignac number, because 8799779917 - 2⁷ = 8799779789 is a prime.

It is a super-2 number, since 2×8799779917² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8799779917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8799779977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4399889958 + 4399889959.

It is an arithmetic number, because the mean of its divisors is an integer number (4399889959).

Almost surely, 2^8799779917 is an apocalyptic number.

It is an amenable number.

8799779917 is a deficient number, since it is larger than the sum of its proper divisors (1).

8799779917 is an equidigital number, since it uses as much as digits as its factorization.

8799779917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 126023688, while the sum is 73.

The square root of 8799779917 is about 93807.1421428028. The cubic root of 8799779917 is about 2064.5430196098.

The spelling of 8799779917 in words is "eight billion, seven hundred ninety-nine million, seven hundred seventy-nine thousand, nine hundred seventeen".