13557855663 has 24 divisors (see below), whose sum is σ = 21532133376. Its totient is φ = 8152174800.

The previous prime is 13557855629. The next prime is 13557855671. The reversal of 13557855663 is 36655875531.

13557855663 is a `hidden beast` number, since 1 + 3 + 5 + 5 + 78 + 5 + 566 + 3 = 666.

It is not a de Polignac number, because 13557855663 - 2⁸ = 13557855407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13557855463) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 526593 + ... + 551738.

It is an arithmetic number, because the mean of its divisors is an integer number (897172224).

Almost surely, 2^13557855663 is an apocalyptic number.

13557855663 is a deficient number, since it is larger than the sum of its proper divisors (7974277713).

13557855663 is a wasteful number, since it uses less digits than its factorization.

13557855663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078475 (or 1078472 counting only the distinct ones).

The product of its digits is 11340000, while the sum is 54.

The spelling of 13557855663 in words is "thirteen billion, five hundred fifty-seven million, eight hundred fifty-five thousand, six hundred sixty-three".