133808138581 has 8 divisors (see below), whose sum is σ = 145137772640. Its totient is φ = 122626604592.

The previous prime is 133808138573. The next prime is 133808138587. The reversal of 133808138581 is 185831808331.

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 133808138581 - 2³ = 133808138573 is a prime.

It is a super-2 number, since 2×133808138581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133808138587) 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, 37023135 + ... + 37026748.

It is an arithmetic number, because the mean of its divisors is an integer number (18142221580).

Almost surely, 2^133808138581 is an apocalyptic number.

It is an amenable number.

133808138581 is a deficient number, since it is larger than the sum of its proper divisors (11329634059).

133808138581 is a wasteful number, since it uses less digits than its factorization.

133808138581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74050035.

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 133808138581 in words is "one hundred thirty-three billion, eight hundred eight million, one hundred thirty-eight thousand, five hundred eighty-one".