136801351681 has 4 divisors (see below), whose sum is σ = 141518639700. Its totient is φ = 132084063664.

The previous prime is 136801351667. The next prime is 136801351693. The reversal of 136801351681 is 186153108631.

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 109059118081 + 27742233600 = 330241^2 + 166560^2 .

It is a cyclic number.

It is not a de Polignac number, because 136801351681 - 2⁷ = 136801351553 is a prime.

It is a super-2 number, since 2×136801351681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (136801351601) 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, 2358643966 + ... + 2358644023.

It is an arithmetic number, because the mean of its divisors is an integer number (35379659925).

Almost surely, 2^136801351681 is an apocalyptic number.

It is an amenable number.

136801351681 is a deficient number, since it is larger than the sum of its proper divisors (4717288019).

136801351681 is an equidigital number, since it uses as much as digits as its factorization.

136801351681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4717288018.

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 136801351681 in words is "one hundred thirty-six billion, eight hundred one million, three hundred fifty-one thousand, six hundred eighty-one".