66012112261 has 2 divisors, whose sum is σ = 66012112262. Its totient is φ = 66012112260.

The previous prime is 66012112253. The next prime is 66012112273. The reversal of 66012112261 is 16221121066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35038224225 + 30973888036 = 187185^2 + 175994^2 .

It is a cyclic number.

It is not a de Polignac number, because 66012112261 - 2³ = 66012112253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66012113261) 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, 33006056130 + 33006056131.

It is an arithmetic number, because the mean of its divisors is an integer number (33006056131).

Almost surely, 2^66012112261 is an apocalyptic number.

It is an amenable number.

66012112261 is a deficient number, since it is larger than the sum of its proper divisors (1).

66012112261 is an equidigital number, since it uses as much as digits as its factorization.

66012112261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 66012112261 in words is "sixty-six billion, twelve million, one hundred twelve thousand, two hundred sixty-one".