55555563 has 24 divisors (see below), whose sum is σ = 90707520. Its totient is φ = 30073680.

The previous prime is 55555559. The next prime is 55555573. The reversal of 55555563 is 36555555.

It is not a de Polignac number, because 55555563 - 2² = 55555559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55555523) 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, 7153 + ... + 12738.

It is an arithmetic number, because the mean of its divisors is an integer number (3779480).

Almost surely, 2^55555563 is an apocalyptic number.

55555563 is a deficient number, since it is larger than the sum of its proper divisors (35151957).

55555563 is a wasteful number, since it uses less digits than its factorization.

55555563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19927 (or 19920 counting only the distinct ones).

The product of its digits is 281250, while the sum is 39.

The square root of 55555563 is about 7453.5604243878. The cubic root of 55555563 is about 381.5714312280.

The spelling of 55555563 in words is "fifty-five million, five hundred fifty-five thousand, five hundred sixty-three".