136037404561721 has 4 divisors (see below), whose sum is σ = 146501820297252. Its totient is φ = 125572988826192.

The previous prime is 136037404561711. The next prime is 136037404561727. The reversal of 136037404561721 is 127165404730631.

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 24431617837225 + 111605786724496 = 4942835^2 + 10564364^2 .

It is a cyclic number.

It is not a de Polignac number, because 136037404561721 - 2²⁶ = 136037337452857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 136037404561721.

It is not an unprimeable number, because it can be changed into a prime (136037404561727) 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, 5232207867746 + ... + 5232207867771.

It is an arithmetic number, because the mean of its divisors is an integer number (36625455074313).

Almost surely, 2^{136037404561721} is an apocalyptic number.

It is an amenable number.

136037404561721 is a deficient number, since it is larger than the sum of its proper divisors (10464415735531).

136037404561721 is a wasteful number, since it uses less digits than its factorization.

136037404561721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10464415735530.

The product of its (nonzero) digits is 2540160, while the sum is 50.

The spelling of 136037404561721 in words is "one hundred thirty-six trillion, thirty-seven billion, four hundred four million, five hundred sixty-one thousand, seven hundred twenty-one".