13555563 has 8 divisors (see below), whose sum is σ = 20656128. Its totient is φ = 7746024.

The previous prime is 13555561. The next prime is 13555583. The reversal of 13555563 is 36555531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13555563 - 2¹ = 13555561 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13555561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322731 + ... + 322772.

It is an arithmetic number, because the mean of its divisors is an integer number (2582016).

Almost surely, 2^13555563 is an apocalyptic number.

13555563 is a deficient number, since it is larger than the sum of its proper divisors (7100565).

13555563 is an equidigital number, since it uses as much as digits as its factorization.

13555563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645513.

The product of its digits is 33750, while the sum is 33.

The square root of 13555563 is about 3681.7880167114. The cubic root of 13555563 is about 238.4363801495.

The spelling of 13555563 in words is "thirteen million, five hundred fifty-five thousand, five hundred sixty-three".