13204565665056 has 144 divisors (see below), whose sum is σ = 39783211007904. Its totient is φ = 4140121208832.

The previous prime is 13204565665037. The next prime is 13204565665091. The reversal of 13204565665056 is 65056656540231.

13204565665056 is a `hidden beast` number, since 1 + 3 + 20 + 4 + 5 + 6 + 566 + 5 + 0 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a junction number, because it is equal to n+sod(n) for n = 13204565664993 and 13204565665011.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7352691 + ... + 8970573.

It is an arithmetic number, because the mean of its divisors is an integer number (276272298666).

Almost surely, 2^{13204565665056} is an apocalyptic number.

13204565665056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13204565665056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19891605503952).

13204565665056 is an abundant number, since it is smaller than the sum of its proper divisors (26578645342848).

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

13204565665056 is a wasteful number, since it uses less digits than its factorization.

13204565665056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1619583 (or 1619572 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 54.

The spelling of 13204565665056 in words is "thirteen trillion, two hundred four billion, five hundred sixty-five million, six hundred sixty-five thousand, fifty-six".