7855617313 has 2 divisors, whose sum is σ = 7855617314. Its totient is φ = 7855617312.

The previous prime is 7855617293. The next prime is 7855617323. The reversal of 7855617313 is 3137165587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7010377984 + 845239329 = 83728^2 + 29073^2 .

It is an emirp because it is prime and its reverse (3137165587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7855617313 - 2¹⁷ = 7855486241 is a prime.

It is not a weakly prime, because it can be changed into another prime (7855617323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3927808656 + 3927808657.

It is an arithmetic number, because the mean of its divisors is an integer number (3927808657).

Almost surely, 2^7855617313 is an apocalyptic number.

It is an amenable number.

7855617313 is a deficient number, since it is larger than the sum of its proper divisors (1).

7855617313 is an equidigital number, since it uses as much as digits as its factorization.

7855617313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 46.

The square root of 7855617313 is about 88631.9203955324. The cubic root of 7855617313 is about 1987.8949916162.

The spelling of 7855617313 in words is "seven billion, eight hundred fifty-five million, six hundred seventeen thousand, three hundred thirteen".