7887818085181 has 2 divisors, whose sum is σ = 7887818085182. Its totient is φ = 7887818085180.

The previous prime is 7887818085163. The next prime is 7887818085253. The reversal of 7887818085181 is 1815808187887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7669388041956 + 218430043225 = 2769366^2 + 467365^2 .

It is a cyclic number.

It is not a de Polignac number, because 7887818085181 - 2¹¹ = 7887818083133 is a prime.

It is a super-2 number, since 2×7887818085181² (a number of 27 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 7887818085181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7887818085781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3943909042590 + 3943909042591.

It is an arithmetic number, because the mean of its divisors is an integer number (3943909042591).

Almost surely, 2^{7887818085181} is an apocalyptic number.

It is an amenable number.

7887818085181 is a deficient number, since it is larger than the sum of its proper divisors (1).

7887818085181 is an equidigital number, since it uses as much as digits as its factorization.

7887818085181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64225280, while the sum is 70.

The spelling of 7887818085181 in words is "seven trillion, eight hundred eighty-seven billion, eight hundred eighteen million, eighty-five thousand, one hundred eighty-one".