133623641543543 has 4 divisors (see below), whose sum is σ = 134423783109840. Its totient is φ = 132823499977248.

The previous prime is 133623641543519. The next prime is 133623641543563. The reversal of 133623641543543 is 345345146326331.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133623641543543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133623641543563) 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, 400070782898 + ... + 400070783231.

It is an arithmetic number, because the mean of its divisors is an integer number (33605945777460).

Almost surely, 2^{133623641543543} is an apocalyptic number.

133623641543543 is a deficient number, since it is larger than the sum of its proper divisors (800141566297).

133623641543543 is an equidigital number, since it uses as much as digits as its factorization.

133623641543543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800141566296.

The product of its digits is 27993600, while the sum is 53.

Adding to 133623641543543 its reverse (345345146326331), we get a palindrome (478968787869874).

The spelling of 133623641543543 in words is "one hundred thirty-three trillion, six hundred twenty-three billion, six hundred forty-one million, five hundred forty-three thousand, five hundred forty-three".