133547668561 has 2 divisors, whose sum is σ = 133547668562. Its totient is φ = 133547668560.

The previous prime is 133547668531. The next prime is 133547668589. The reversal of 133547668561 is 165866745331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122738115600 + 10809552961 = 350340^2 + 103969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133547668561 is a prime.

It is not a weakly prime, because it can be changed into another prime (133547668531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66773834280 + 66773834281.

It is an arithmetic number, because the mean of its divisors is an integer number (66773834281).

Almost surely, 2^133547668561 is an apocalyptic number.

It is an amenable number.

133547668561 is a deficient number, since it is larger than the sum of its proper divisors (1).

133547668561 is an equidigital number, since it uses as much as digits as its factorization.

133547668561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 55.

The spelling of 133547668561 in words is "one hundred thirty-three billion, five hundred forty-seven million, six hundred sixty-eight thousand, five hundred sixty-one".