133681608237 has 4 divisors (see below), whose sum is σ = 178242144320. Its totient is φ = 89121072156.

The previous prime is 133681608217. The next prime is 133681608253. The reversal of 133681608237 is 732806186331.

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 133681608237 - 2⁸ = 133681607981 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 (133681608217) 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, 22280268037 + ... + 22280268042.

It is an arithmetic number, because the mean of its divisors is an integer number (44560536080).

Almost surely, 2^133681608237 is an apocalyptic number.

It is an amenable number.

133681608237 is a deficient number, since it is larger than the sum of its proper divisors (44560536083).

133681608237 is an equidigital number, since it uses as much as digits as its factorization.

133681608237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44560536082.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 133681608237 in words is "one hundred thirty-three billion, six hundred eighty-one million, six hundred eight thousand, two hundred thirty-seven".