20136537335449 has 2 divisors, whose sum is σ = 20136537335450. Its totient is φ = 20136537335448.

The previous prime is 20136537335419. The next prime is 20136537335501. The reversal of 20136537335449 is 94453373563102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18971530119424 + 1165007216025 = 4355632^2 + 1079355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20136537335449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20136537335449.

It is not a weakly prime, because it can be changed into another prime (20136537335419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10068268667724 + 10068268667725.

It is an arithmetic number, because the mean of its divisors is an integer number (10068268667725).

Almost surely, 2^{20136537335449} is an apocalyptic number.

It is an amenable number.

20136537335449 is a deficient number, since it is larger than the sum of its proper divisors (1).

20136537335449 is an equidigital number, since it uses as much as digits as its factorization.

20136537335449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24494400, while the sum is 55.

The spelling of 20136537335449 in words is "twenty trillion, one hundred thirty-six billion, five hundred thirty-seven million, three hundred thirty-five thousand, four hundred forty-nine".