133557023617 has 4 divisors (see below), whose sum is σ = 133593528240. Its totient is φ = 133520518996.

The previous prime is 133557023563. The next prime is 133557023623. The reversal of 133557023617 is 716320755331.

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 a cyclic number.

It is not a de Polignac number, because 133557023617 - 2²⁷ = 133422805889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133557023317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18246823 + ... + 18254140.

It is an arithmetic number, because the mean of its divisors is an integer number (33398382060).

Almost surely, 2^133557023617 is an apocalyptic number.

It is an amenable number.

133557023617 is a deficient number, since it is larger than the sum of its proper divisors (36504623).

133557023617 is an equidigital number, since it uses as much as digits as its factorization.

133557023617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36504622.

The product of its (nonzero) digits is 396900, while the sum is 43.

Adding to 133557023617 its reverse (716320755331), we get a palindrome (849877778948).

The spelling of 133557023617 in words is "one hundred thirty-three billion, five hundred fifty-seven million, twenty-three thousand, six hundred seventeen".