55505563 has 4 divisors (see below), whose sum is σ = 55571488. Its totient is φ = 55439640.

The previous prime is 55505557. The next prime is 55505581. The reversal of 55505563 is 36550555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55505563 - 2¹³ = 55497371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55505963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31683 + ... + 33388.

It is an arithmetic number, because the mean of its divisors is an integer number (13892872).

Almost surely, 2^55505563 is an apocalyptic number.

55505563 is a deficient number, since it is larger than the sum of its proper divisors (65925).

55505563 is an equidigital number, since it uses as much as digits as its factorization.

55505563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65924.

The product of its (nonzero) digits is 56250, while the sum is 34.

The square root of 55505563 is about 7450.2055676337. The cubic root of 55505563 is about 381.4569254553.

The spelling of 55505563 in words is "fifty-five million, five hundred five thousand, five hundred sixty-three".