136220043637 has 4 divisors (see below), whose sum is σ = 139901666476. Its totient is φ = 132538420800.

The previous prime is 136220043611. The next prime is 136220043683. The reversal of 136220043637 is 736340022631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 736340022631 = 241 ⋅3055352791.

It can be written as a sum of positive squares in 2 ways, for example, as 83999110276 + 52220933361 = 289826^2 + 228519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136220043637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 3681622801 = 136220043637 / (1 + 3 + 6 + 2 + 2 + 0 + 0 + 4 + 3 + 6 + 3 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136220043596 and 136220043605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136220043697) 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, 1840811364 + ... + 1840811437.

It is an arithmetic number, because the mean of its divisors is an integer number (34975416619).

Almost surely, 2^136220043637 is an apocalyptic number.

It is an amenable number.

136220043637 is a deficient number, since it is larger than the sum of its proper divisors (3681622839).

136220043637 is an equidigital number, since it uses as much as digits as its factorization.

136220043637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681622838.

The product of its (nonzero) digits is 108864, while the sum is 37.

The spelling of 136220043637 in words is "one hundred thirty-six billion, two hundred twenty million, forty-three thousand, six hundred thirty-seven".