133255236581 has 2 divisors, whose sum is σ = 133255236582. Its totient is φ = 133255236580.

The previous prime is 133255236571. The next prime is 133255236599. The reversal of 133255236581 is 185632552331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95644840225 + 37610396356 = 309265^2 + 193934^2 .

It is a cyclic number.

It is not a de Polignac number, because 133255236581 - 2¹⁰ = 133255235557 is a prime.

It is a super-2 number, since 2×133255236581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133255236571) 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, 66627618290 + 66627618291.

It is an arithmetic number, because the mean of its divisors is an integer number (66627618291).

Almost surely, 2^133255236581 is an apocalyptic number.

It is an amenable number.

133255236581 is a deficient number, since it is larger than the sum of its proper divisors (1).

133255236581 is an equidigital number, since it uses as much as digits as its factorization.

133255236581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 44.

The spelling of 133255236581 in words is "one hundred thirty-three billion, two hundred fifty-five million, two hundred thirty-six thousand, five hundred eighty-one".