135563521656 has 64 divisors (see below), whose sum is σ = 346556206080. Its totient is φ = 44170613120.

The previous prime is 135563521619. The next prime is 135563521669. The reversal of 135563521656 is 656125365531.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 823621 + ... + 974411.

It is an arithmetic number, because the mean of its divisors is an integer number (5414940720).

Almost surely, 2^135563521656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135563521656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173278103040).

135563521656 is an abundant number, since it is smaller than the sum of its proper divisors (210992684424).

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

135563521656 is a wasteful number, since it uses less digits than its factorization.

135563521656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151644 (or 151640 counting only the distinct ones).

The product of its digits is 2430000, while the sum is 48.

The spelling of 135563521656 in words is "one hundred thirty-five billion, five hundred sixty-three million, five hundred twenty-one thousand, six hundred fifty-six".