7818081541 has 2 divisors, whose sum is σ = 7818081542. Its totient is φ = 7818081540.

The previous prime is 7818081527. The next prime is 7818081553. The reversal of 7818081541 is 1451808187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6179532100 + 1638549441 = 78610^2 + 40479^2 .

It is a cyclic number.

It is not a de Polignac number, because 7818081541 - 2²¹ = 7815984389 is a prime.

It is a super-2 number, since 2×7818081541² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7810081541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3909040770 + 3909040771.

It is an arithmetic number, because the mean of its divisors is an integer number (3909040771).

Almost surely, 2^7818081541 is an apocalyptic number.

It is an amenable number.

7818081541 is a deficient number, since it is larger than the sum of its proper divisors (1).

7818081541 is an equidigital number, since it uses as much as digits as its factorization.

7818081541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71680, while the sum is 43.

The square root of 7818081541 is about 88419.9159748526. The cubic root of 7818081541 is about 1984.7237434875.

The spelling of 7818081541 in words is "seven billion, eight hundred eighteen million, eighty-one thousand, five hundred forty-one".