135787820549 has 2 divisors, whose sum is σ = 135787820550. Its totient is φ = 135787820548.

The previous prime is 135787820507. The next prime is 135787820573. The reversal of 135787820549 is 945028787531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128868076324 + 6919744225 = 358982^2 + 83185^2 .

It is a cyclic number.

It is not a de Polignac number, because 135787820549 - 2²⁰ = 135786771973 is a prime.

It is a super-2 number, since 2×135787820549² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135787820579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67893910274 + 67893910275.

It is an arithmetic number, because the mean of its divisors is an integer number (67893910275).

Almost surely, 2^135787820549 is an apocalyptic number.

It is an amenable number.

135787820549 is a deficient number, since it is larger than the sum of its proper divisors (1).

135787820549 is an equidigital number, since it uses as much as digits as its factorization.

135787820549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16934400, while the sum is 59.

The spelling of 135787820549 in words is "one hundred thirty-five billion, seven hundred eighty-seven million, eight hundred twenty thousand, five hundred forty-nine".