7855819117 has 2 divisors, whose sum is σ = 7855819118. Its totient is φ = 7855819116.

The previous prime is 7855819057. The next prime is 7855819121. The reversal of 7855819117 is 7119185587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6116178436 + 1739640681 = 78206^2 + 41709^2 .

It is a cyclic number.

It is not a de Polignac number, because 7855819117 - 2¹¹ = 7855817069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7855819177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3927909558 + 3927909559.

It is an arithmetic number, because the mean of its divisors is an integer number (3927909559).

Almost surely, 2^7855819117 is an apocalyptic number.

It is an amenable number.

7855819117 is a deficient number, since it is larger than the sum of its proper divisors (1).

7855819117 is an equidigital number, since it uses as much as digits as its factorization.

7855819117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 52.

The square root of 7855819117 is about 88633.0588268283. The cubic root of 7855819117 is about 1987.9120139035.

The spelling of 7855819117 in words is "seven billion, eight hundred fifty-five million, eight hundred nineteen thousand, one hundred seventeen".