6512168081 has 2 divisors, whose sum is σ = 6512168082. Its totient is φ = 6512168080.

The previous prime is 6512168059. The next prime is 6512168093. The reversal of 6512168081 is 1808612156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6434446225 + 77721856 = 80215^2 + 8816^2 .

It is a cyclic number.

It is not a de Polignac number, because 6512168081 - 2¹⁸ = 6511905937 is a prime.

It is a super-3 number, since 3×6512168081³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (6512168981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3256084040 + 3256084041.

It is an arithmetic number, because the mean of its divisors is an integer number (3256084041).

Almost surely, 2^6512168081 is an apocalyptic number.

It is an amenable number.

6512168081 is a deficient number, since it is larger than the sum of its proper divisors (1).

6512168081 is an equidigital number, since it uses as much as digits as its factorization.

6512168081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 38.

The square root of 6512168081 is about 80698.0054338396. The cubic root of 6512168081 is about 1867.4194037117.

The spelling of 6512168081 in words is "six billion, five hundred twelve million, one hundred sixty-eight thousand, eighty-one".