55565553 has 4 divisors (see below), whose sum is σ = 74087408. Its totient is φ = 37043700.

The previous prime is 55565533. The next prime is 55565563. The reversal of 55565553 is 35556555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 55565553 - 2⁸ = 55565297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55565533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9260923 + ... + 9260928.

It is an arithmetic number, because the mean of its divisors is an integer number (18521852).

Almost surely, 2^55565553 is an apocalyptic number.

It is an amenable number.

55565553 is a deficient number, since it is larger than the sum of its proper divisors (18521855).

55565553 is a wasteful number, since it uses less digits than its factorization.

55565553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18521854.

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

The square root of 55565553 is about 7454.2305437919. The cubic root of 55565553 is about 381.5943012457.

The spelling of 55565553 in words is "fifty-five million, five hundred sixty-five thousand, five hundred fifty-three".