133106987557 has 4 divisors (see below), whose sum is σ = 133587518476. Its totient is φ = 132626456640.

The previous prime is 133106987483. The next prime is 133106987581. The reversal of 133106987557 is 755789601331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755789601331 = 17 ⋅44458211843.

It can be written as a sum of positive squares in 2 ways, for example, as 94073477796 + 39033509761 = 306714^2 + 197569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133106987557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 133106987498 and 133106987507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133106987357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240265044 + ... + 240265597.

It is an arithmetic number, because the mean of its divisors is an integer number (33396879619).

Almost surely, 2^133106987557 is an apocalyptic number.

It is an amenable number.

133106987557 is a deficient number, since it is larger than the sum of its proper divisors (480530919).

133106987557 is an equidigital number, since it uses as much as digits as its factorization.

133106987557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480530918.

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 133106987557 in words is "one hundred thirty-three billion, one hundred six million, nine hundred eighty-seven thousand, five hundred fifty-seven".