135681726825 has 18 divisors (see below), whose sum is σ = 243021048894. Its totient is φ = 72363587520.

The previous prime is 135681726787. The next prime is 135681726841. The reversal of 135681726825 is 528627186531.

135681726825 is a `hidden beast` number, since 1 + 3 + 568 + 1 + 72 + 6 + 8 + 2 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 47887444224 + 87794282601 = 218832^2 + 296301^2 .

It is not a de Polignac number, because 135681726825 - 2²⁰ = 135680678249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 301514724 + ... + 301515173.

It is an arithmetic number, because the mean of its divisors is an integer number (13501169383).

Almost surely, 2^135681726825 is an apocalyptic number.

135681726825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135681726825 is a deficient number, since it is larger than the sum of its proper divisors (107339322069).

135681726825 is a wasteful number, since it uses less digits than its factorization.

135681726825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603029913 (or 603029905 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 135681726825 in words is "one hundred thirty-five billion, six hundred eighty-one million, seven hundred twenty-six thousand, eight hundred twenty-five".