133169915881 has 4 divisors (see below), whose sum is σ = 133170784852. Its totient is φ = 133169046912.

The previous prime is 133169915873. The next prime is 133169915891. The reversal of 133169915881 is 188519961331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 56501290000 + 76668625881 = 237700^2 + 276891^2 .

It is a cyclic number.

It is not a de Polignac number, because 133169915881 - 2³ = 133169915873 is a prime.

It is a super-2 number, since 2×133169915881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133169915831) 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, 136476 + ... + 533821.

It is an arithmetic number, because the mean of its divisors is an integer number (33292696213).

Almost surely, 2^133169915881 is an apocalyptic number.

It is an amenable number.

133169915881 is a deficient number, since it is larger than the sum of its proper divisors (868971).

133169915881 is an equidigital number, since it uses as much as digits as its factorization.

133169915881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868970.

The product of its digits is 1399680, while the sum is 55.

The spelling of 133169915881 in words is "one hundred thirty-three billion, one hundred sixty-nine million, nine hundred fifteen thousand, eight hundred eighty-one".