66969685441 has 2 divisors, whose sum is σ = 66969685442. Its totient is φ = 66969685440.

The previous prime is 66969685421. The next prime is 66969685451. The reversal of 66969685441 is 14458696966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66969676225 + 9216 = 258785^2 + 96^2 .

It is a cyclic number.

It is not a de Polignac number, because 66969685441 - 2⁷ = 66969685313 is a prime.

It is not a weakly prime, because it can be changed into another prime (66969685421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33484842720 + 33484842721.

It is an arithmetic number, because the mean of its divisors is an integer number (33484842721).

Almost surely, 2^66969685441 is an apocalyptic number.

It is an amenable number.

66969685441 is a deficient number, since it is larger than the sum of its proper divisors (1).

66969685441 is an equidigital number, since it uses as much as digits as its factorization.

66969685441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67184640, while the sum is 64.

The spelling of 66969685441 in words is "sixty-six billion, nine hundred sixty-nine million, six hundred eighty-five thousand, four hundred forty-one".