133557311623 has 4 divisors (see below), whose sum is σ = 133582616640. Its totient is φ = 133532006608.

The previous prime is 133557311611. The next prime is 133557311659. The reversal of 133557311623 is 326113755331.

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

It is a cyclic number.

It is not a de Polignac number, because 133557311623 - 2²⁹ = 133020440711 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 (133557311683) 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, 12644590 + ... + 12655147.

It is an arithmetic number, because the mean of its divisors is an integer number (33395654160).

Almost surely, 2^133557311623 is an apocalyptic number.

133557311623 is a deficient number, since it is larger than the sum of its proper divisors (25305017).

133557311623 is an equidigital number, since it uses as much as digits as its factorization.

133557311623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25305016.

The product of its digits is 170100, while the sum is 40.

The spelling of 133557311623 in words is "one hundred thirty-three billion, five hundred fifty-seven million, three hundred eleven thousand, six hundred twenty-three".