135685802561677 has 2 divisors, whose sum is σ = 135685802561678. Its totient is φ = 135685802561676.

The previous prime is 135685802561663. The next prime is 135685802561693. The reversal of 135685802561677 is 776165208586531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75908457802116 + 59777344759561 = 8712546^2 + 7731581^2 .

It is a cyclic number.

It is not a de Polignac number, because 135685802561677 - 2⁷ = 135685802561549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135685802568677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67842901280838 + 67842901280839.

It is an arithmetic number, because the mean of its divisors is an integer number (67842901280839).

Almost surely, 2^{135685802561677} is an apocalyptic number.

It is an amenable number.

135685802561677 is a deficient number, since it is larger than the sum of its proper divisors (1).

135685802561677 is an equidigital number, since it uses as much as digits as its factorization.

135685802561677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032000, while the sum is 70.

The spelling of 135685802561677 in words is "one hundred thirty-five trillion, six hundred eighty-five billion, eight hundred two million, five hundred sixty-one thousand, six hundred seventy-seven".