133026172181681 has 16 divisors (see below), whose sum is σ = 136535715875520. Its totient is φ = 129561607338240.

The previous prime is 133026172181659. The next prime is 133026172181699. The reversal of 133026172181681 is 186181271620331.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 133026172181681 - 2³⁸ = 132751294274737 is a prime.

It is a super-2 number, since 2×133026172181681² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (133026172181281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116167886 + ... + 117307416.

It is an arithmetic number, because the mean of its divisors is an integer number (8533482242220).

Almost surely, 2^{133026172181681} is an apocalyptic number.

It is an amenable number.

133026172181681 is a deficient number, since it is larger than the sum of its proper divisors (3509543693839).

133026172181681 is a wasteful number, since it uses less digits than its factorization.

133026172181681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159264.

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 133026172181681 in words is "one hundred thirty-three trillion, twenty-six billion, one hundred seventy-two million, one hundred eighty-one thousand, six hundred eighty-one".