135661566353542 has 8 divisors (see below), whose sum is σ = 208992142760976. Its totient is φ = 65997518766552.

The previous prime is 135661566353477. The next prime is 135661566353581. The reversal of 135661566353542 is 245353665166531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 916632205018 + ... + 916632205165.

It is an arithmetic number, because the mean of its divisors is an integer number (26124017845122).

Almost surely, 2^{135661566353542} is an apocalyptic number.

135661566353542 is a deficient number, since it is larger than the sum of its proper divisors (73330576407434).

135661566353542 is a wasteful number, since it uses less digits than its factorization.

135661566353542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833264410222.

The product of its digits is 174960000, while the sum is 61.

The spelling of 135661566353542 in words is "one hundred thirty-five trillion, six hundred sixty-one billion, five hundred sixty-six million, three hundred fifty-three thousand, five hundred forty-two".