135256661 has 2 divisors, whose sum is σ = 135256662. Its totient is φ = 135256660.

The previous prime is 135256657. The next prime is 135256739. The reversal of 135256661 is 166652531.

135256661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129254161 + 6002500 = 11369^2 + 2450^2 .

It is a cyclic number.

It is not a de Polignac number, because 135256661 - 2² = 135256657 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135256631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67628330 + 67628331.

It is an arithmetic number, because the mean of its divisors is an integer number (67628331).

Almost surely, 2^135256661 is an apocalyptic number.

It is an amenable number.

135256661 is a deficient number, since it is larger than the sum of its proper divisors (1).

135256661 is an equidigital number, since it uses as much as digits as its factorization.

135256661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 35.

The square root of 135256661 is about 11629.9897248450. The cubic root of 135256661 is about 513.3176775552.

The spelling of 135256661 in words is "one hundred thirty-five million, two hundred fifty-six thousand, six hundred sixty-one".