133873307721578 has 4 divisors (see below), whose sum is σ = 200809961582370. Its totient is φ = 66936653860788.

The previous prime is 133873307721577. The next prime is 133873307721611. The reversal of 133873307721578 is 875127703378331.

It is a happy number.

133873307721578 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 119961922060369 + 13911385661209 = 10952713^2 + 3729797^2 .

It is not an unprimeable number, because it can be changed into a prime (133873307721577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33468326930393 + ... + 33468326930396.

Almost surely, 2^{133873307721578} is an apocalyptic number.

133873307721578 is a deficient number, since it is larger than the sum of its proper divisors (66936653860792).

133873307721578 is an equidigital number, since it uses as much as digits as its factorization.

133873307721578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66936653860791.

The product of its (nonzero) digits is 124467840, while the sum is 65.

The spelling of 133873307721578 in words is "one hundred thirty-three trillion, eight hundred seventy-three billion, three hundred seven million, seven hundred twenty-one thousand, five hundred seventy-eight".