7565998081 has 2 divisors, whose sum is σ = 7565998082. Its totient is φ = 7565998080.

The previous prime is 7565998073. The next prime is 7565998117. The reversal of 7565998081 is 1808995657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7171379856 + 394618225 = 84684^2 + 19865^2 .

It is a cyclic number.

It is not a de Polignac number, because 7565998081 - 2³ = 7565998073 is a prime.

It is a super-2 number, since 2×7565998081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7565998061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3782999040 + 3782999041.

It is an arithmetic number, because the mean of its divisors is an integer number (3782999041).

Almost surely, 2^7565998081 is an apocalyptic number.

It is an amenable number.

7565998081 is a deficient number, since it is larger than the sum of its proper divisors (1).

7565998081 is an equidigital number, since it uses as much as digits as its factorization.

7565998081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5443200, while the sum is 58.

The square root of 7565998081 is about 86982.7458810079. The cubic root of 7565998081 is about 1963.1586997143.

The spelling of 7565998081 in words is "seven billion, five hundred sixty-five million, nine hundred ninety-eight thousand, eighty-one".