133633340406561 has 4 divisors (see below), whose sum is σ = 178177787208752. Its totient is φ = 89088893604372.

The previous prime is 133633340406547. The next prime is 133633340406589. The reversal of 133633340406561 is 165604043336331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 133633340406561 - 2³⁵ = 133598980668193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133633340406561.

It is not an unprimeable number, because it can be changed into a prime (133633342406561) 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, 22272223401091 + ... + 22272223401096.

It is an arithmetic number, because the mean of its divisors is an integer number (44544446802188).

Almost surely, 2^{133633340406561} is an apocalyptic number.

It is an amenable number.

133633340406561 is a deficient number, since it is larger than the sum of its proper divisors (44544446802191).

133633340406561 is an equidigital number, since it uses as much as digits as its factorization.

133633340406561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44544446802190.

The product of its (nonzero) digits is 4199040, while the sum is 48.

The spelling of 133633340406561 in words is "one hundred thirty-three trillion, six hundred thirty-three billion, three hundred forty million, four hundred six thousand, five hundred sixty-one".