13436581603781 has 16 divisors (see below), whose sum is σ = 15956427644928. Its totient is φ = 11071739934000.

The previous prime is 13436581603751. The next prime is 13436581603787. The reversal of 13436581603781 is 18730618563431.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13436581603781 - 2³⁰ = 13435507861957 is a prime.

It is a super-2 number, since 2×13436581603781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13436581603787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204999455 + ... + 205064988.

It is an arithmetic number, because the mean of its divisors is an integer number (997276727808).

Almost surely, 2^{13436581603781} is an apocalyptic number.

It is an amenable number.

13436581603781 is a deficient number, since it is larger than the sum of its proper divisors (2519846041147).

13436581603781 is a wasteful number, since it uses less digits than its factorization.

13436581603781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410064632.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 13436581603781 in words is "thirteen trillion, four hundred thirty-six billion, five hundred eighty-one million, six hundred three thousand, seven hundred eighty-one".