135581808050 has 48 divisors (see below), whose sum is σ = 272226425352. Its totient is φ = 49941964800.

The previous prime is 135581807983. The next prime is 135581808053. The reversal of 135581808050 is 50808185531.

It can be written as a sum of positive squares in 12 ways, for example, as 1818254881 + 133763553169 = 42641^2 + 365737^2 .

It is a junction number, because it is equal to n+sod(n) for n = 135581807992 and 135581808010.

It is not an unprimeable number, because it can be changed into a prime (135581808053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25922 + ... + 521378.

Almost surely, 2^135581808050 is an apocalyptic number.

135581808050 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

135581808050 is an abundant number, since it is smaller than the sum of its proper divisors (136644617302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135581808050 is a wasteful number, since it uses less digits than its factorization.

135581808050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495903 (or 495898 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 44.

It can be divided in two parts, 135 and 581808050, that added together give a palindrome (581808185).

The spelling of 135581808050 in words is "one hundred thirty-five billion, five hundred eighty-one million, eight hundred eight thousand, fifty".