133256768065321 has 4 divisors (see below), whose sum is σ = 135082203244372. Its totient is φ = 131431332886272.

The previous prime is 133256768065303. The next prime is 133256768065361. The reversal of 133256768065321 is 123560867652331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99387440955625 + 33869327109696 = 9969325^2 + 5819736^2 .

It is a cyclic number.

It is not a de Polignac number, because 133256768065321 - 2³¹ = 133254620581673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133256768065361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 912717589416 + ... + 912717589561.

It is an arithmetic number, because the mean of its divisors is an integer number (33770550811093).

Almost surely, 2^{133256768065321} is an apocalyptic number.

It is an amenable number.

133256768065321 is a deficient number, since it is larger than the sum of its proper divisors (1825435179051).

133256768065321 is an equidigital number, since it uses as much as digits as its factorization.

133256768065321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825435179050.

The product of its (nonzero) digits is 32659200, while the sum is 58.

The spelling of 133256768065321 in words is "one hundred thirty-three trillion, two hundred fifty-six billion, seven hundred sixty-eight million, sixty-five thousand, three hundred twenty-one".