66060511081 has 2 divisors, whose sum is σ = 66060511082. Its totient is φ = 66060511080.

The previous prime is 66060511051. The next prime is 66060511087. The reversal of 66060511081 is 18011506066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65749165056 + 311346025 = 256416^2 + 17645^2 .

It is a cyclic number.

It is not a de Polignac number, because 66060511081 - 2²¹ = 66058413929 is a prime.

It is a super-3 number, since 3×66060511081³ (a number of 33 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 (66060511087) 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, 33030255540 + 33030255541.

It is an arithmetic number, because the mean of its divisors is an integer number (33030255541).

Almost surely, 2^66060511081 is an apocalyptic number.

It is an amenable number.

66060511081 is a deficient number, since it is larger than the sum of its proper divisors (1).

66060511081 is an equidigital number, since it uses as much as digits as its factorization.

66060511081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 66060511081 in words is "sixty-six billion, sixty million, five hundred eleven thousand, eighty-one".