136255123261 has 2 divisors, whose sum is σ = 136255123262. Its totient is φ = 136255123260.

The previous prime is 136255123259. The next prime is 136255123273. The reversal of 136255123261 is 162321552631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101080120761 + 35175002500 = 317931^2 + 187550^2 .

It is a cyclic number.

It is not a de Polignac number, because 136255123261 - 2¹ = 136255123259 is a prime.

It is a super-2 number, since 2×136255123261² (a number of 23 digits) contains 22 as substring.

Together with 136255123259, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 136255123261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136255123211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68127561630 + 68127561631.

It is an arithmetic number, because the mean of its divisors is an integer number (68127561631).

Almost surely, 2^136255123261 is an apocalyptic number.

It is an amenable number.

136255123261 is a deficient number, since it is larger than the sum of its proper divisors (1).

136255123261 is an equidigital number, since it uses as much as digits as its factorization.

136255123261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

Adding to 136255123261 its reverse (162321552631), we get a palindrome (298576675892).

The spelling of 136255123261 in words is "one hundred thirty-six billion, two hundred fifty-five million, one hundred twenty-three thousand, two hundred sixty-one".