136806253455181 has 4 divisors (see below), whose sum is σ = 136922092790364. Its totient is φ = 136690414120000.

The previous prime is 136806253455167. The next prime is 136806253455187. The reversal of 136806253455181 is 181554352608631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 124675201298025 + 12131052157156 = 11165805^2 + 3482966^2 .

It is a cyclic number.

It is not a de Polignac number, because 136806253455181 - 2³⁹ = 136256497641293 is a prime.

It is a super-2 number, since 2×136806253455181² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136806253455187) 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, 57919665820 + ... + 57919668181.

It is an arithmetic number, because the mean of its divisors is an integer number (34230523197591).

Almost surely, 2^{136806253455181} is an apocalyptic number.

It is an amenable number.

136806253455181 is a deficient number, since it is larger than the sum of its proper divisors (115839335183).

136806253455181 is a wasteful number, since it uses less digits than its factorization.

136806253455181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115839335182.

The product of its (nonzero) digits is 20736000, while the sum is 58.

The spelling of 136806253455181 in words is "one hundred thirty-six trillion, eight hundred six billion, two hundred fifty-three million, four hundred fifty-five thousand, one hundred eighty-one".