133681608191 has 4 divisors (see below), whose sum is σ = 133683345984. Its totient is φ = 133679870400.

The previous prime is 133681608133. The next prime is 133681608209. The reversal of 133681608191 is 191806186331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191806186331 = 17 ⋅11282716843.

It is a cyclic number.

It is not a de Polignac number, because 133681608191 - 2²² = 133677413887 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 (133681608091) 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, 747890 + ... + 909231.

It is an arithmetic number, because the mean of its divisors is an integer number (33420836496).

Almost surely, 2^133681608191 is an apocalyptic number.

133681608191 is a deficient number, since it is larger than the sum of its proper divisors (1737793).

133681608191 is an equidigital number, since it uses as much as digits as its factorization.

133681608191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1737792.

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 133681608191 in words is "one hundred thirty-three billion, six hundred eighty-one million, six hundred eight thousand, one hundred ninety-one".