13056781566 has 16 divisors (see below), whose sum is σ = 26170709904. Its totient is φ = 4342736064.

The previous prime is 13056781553. The next prime is 13056781601. The reversal of 13056781566 is 66518765031.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2378145 + ... + 2383628.

It is an arithmetic number, because the mean of its divisors is an integer number (1635669369).

Almost surely, 2^13056781566 is an apocalyptic number.

13056781566 is an abundant number, since it is smaller than the sum of its proper divisors (13113928338).

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

13056781566 is a wasteful number, since it uses less digits than its factorization.

13056781566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4762235.

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 13056781566 in words is "thirteen billion, fifty-six million, seven hundred eighty-one thousand, five hundred sixty-six".