13561875632778 has 128 divisors (see below), whose sum is σ = 30386015170560. Its totient is φ = 3999543744000.

The previous prime is 13561875632729. The next prime is 13561875632791. The reversal of 13561875632778 is 87723657816531.

13561875632778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4086131403 + ... + 4086134721.

It is an arithmetic number, because the mean of its divisors is an integer number (237390743520).

Almost surely, 2^{13561875632778} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13561875632778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15193007585280).

13561875632778 is an abundant number, since it is smaller than the sum of its proper divisors (16824139537782).

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

13561875632778 is a wasteful number, since it uses less digits than its factorization.

13561875632778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6644.

The product of its digits is 355622400, while the sum is 69.

The spelling of 13561875632778 in words is "thirteen trillion, five hundred sixty-one billion, eight hundred seventy-five million, six hundred thirty-two thousand, seven hundred seventy-eight".