135661878043747 has 16 divisors (see below), whose sum is σ = 151213543824384. Its totient is φ = 120649102128000.

The previous prime is 135661878043739. The next prime is 135661878043751. The reversal of 135661878043747 is 747340878166531.

It is a cyclic number.

It is not a de Polignac number, because 135661878043747 - 2³ = 135661878043739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135661878043717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59595879 + ... + 61830352.

It is an arithmetic number, because the mean of its divisors is an integer number (9450846489024).

Almost surely, 2^{135661878043747} is an apocalyptic number.

135661878043747 is a deficient number, since it is larger than the sum of its proper divisors (15551665780637).

135661878043747 is a wasteful number, since it uses less digits than its factorization.

135661878043747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121428450.

The product of its (nonzero) digits is 568995840, while the sum is 70.

The spelling of 135661878043747 in words is "one hundred thirty-five trillion, six hundred sixty-one billion, eight hundred seventy-eight million, forty-three thousand, seven hundred forty-seven".