133689128691 has 8 divisors (see below), whose sum is σ = 178825330944. Its totient is φ = 88839506120.

The previous prime is 133689128659. The next prime is 133689128701. The reversal of 133689128691 is 196821986331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 133689128691 - 2⁵ = 133689128659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133689118691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71643831 + ... + 71645696.

It is an arithmetic number, because the mean of its divisors is an integer number (22353166368).

Almost surely, 2^133689128691 is an apocalyptic number.

133689128691 is a deficient number, since it is larger than the sum of its proper divisors (45136202253).

133689128691 is a wasteful number, since it uses less digits than its factorization.

133689128691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143289841.

The product of its digits is 3359232, while the sum is 57.

The spelling of 133689128691 in words is "one hundred thirty-three billion, six hundred eighty-nine million, one hundred twenty-eight thousand, six hundred ninety-one".