135725763581 has 2 divisors, whose sum is σ = 135725763582. Its totient is φ = 135725763580.

The previous prime is 135725763577. The next prime is 135725763647. The reversal of 135725763581 is 185367527531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76413544900 + 59312218681 = 276430^2 + 243541^2 .

It is an emirp because it is prime and its reverse (185367527531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 135725763581 - 2² = 135725763577 is a prime.

It is a super-2 number, since 2×135725763581² (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 (135725760581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67862881790 + 67862881791.

It is an arithmetic number, because the mean of its divisors is an integer number (67862881791).

Almost surely, 2^135725763581 is an apocalyptic number.

It is an amenable number.

135725763581 is a deficient number, since it is larger than the sum of its proper divisors (1).

135725763581 is an equidigital number, since it uses as much as digits as its factorization.

135725763581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292000, while the sum is 53.

The spelling of 135725763581 in words is "one hundred thirty-five billion, seven hundred twenty-five million, seven hundred sixty-three thousand, five hundred eighty-one".