135661686441766 has 16 divisors (see below), whose sum is σ = 203725194439680. Its totient is φ = 67753295089480.

The previous prime is 135661686441751. The next prime is 135661686441773. The reversal of 135661686441766 is 667144686166531.

It is a junction number, because it is equal to n+sod(n) for n = 135661686441695 and 135661686441704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38518995 + ... + 41893153.

It is an arithmetic number, because the mean of its divisors is an integer number (12732824652480).

Almost surely, 2^{135661686441766} is an apocalyptic number.

135661686441766 is a deficient number, since it is larger than the sum of its proper divisors (68063507997914).

135661686441766 is a wasteful number, since it uses less digits than its factorization.

135661686441766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397139.

The product of its digits is 627056640, while the sum is 70.

The spelling of 135661686441766 in words is "one hundred thirty-five trillion, six hundred sixty-one billion, six hundred eighty-six million, four hundred forty-one thousand, seven hundred sixty-six".