135561637892836 has 81 divisors (see below), whose sum is σ = 247191492064699. Its totient is φ = 65047451269696.

The previous prime is 135561637892783. The next prime is 135561637892839. The reversal of 135561637892836 is 638298736165531.

The square root of 135561637892836 is 11643094.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 51902370748900 + 83659267143936 = 7204330^2 + 9146544^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135561637892839) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 133033991535 + ... + 133033992553.

Almost surely, 2^{135561637892836} is an apocalyptic number.

135561637892836 is the 11643094-th square number.

It is an amenable number.

135561637892836 is a deficient number, since it is larger than the sum of its proper divisors (111629854171863).

135561637892836 is an frugal number, since it uses more digits than its factorization.

135561637892836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494 (or 1247 counting only the distinct ones).

The product of its digits is 1175731200, while the sum is 73.

The spelling of 135561637892836 in words is "one hundred thirty-five trillion, five hundred sixty-one billion, six hundred thirty-seven million, eight hundred ninety-two thousand, eight hundred thirty-six".