135661686441536 has 28 divisors (see below), whose sum is σ = 271673417386140. Its totient is φ = 67208541903360.

The previous prime is 135661686441529. The next prime is 135661686441551. The reversal of 135661686441536 is 635144686166531.

It can be written as a sum of positive squares in 2 ways, for example, as 78961991235136 + 56699695206400 = 8886056^2 + 7529920^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9723451055 + ... + 9723465006.

It is an arithmetic number, because the mean of its divisors is an integer number (9702622049505).

Almost surely, 2^{135661686441536} is an apocalyptic number.

135661686441536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

135661686441536 is an abundant number, since it is smaller than the sum of its proper divisors (136011730944604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135661686441536 is a wasteful number, since it uses less digits than its factorization.

135661686441536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19446916182 (or 19446916172 counting only the distinct ones).

The product of its digits is 223948800, while the sum is 65.

The spelling of 135661686441536 in words is "one hundred thirty-five trillion, six hundred sixty-one billion, six hundred eighty-six million, four hundred forty-one thousand, five hundred thirty-six".