55565521 has 4 divisors (see below), whose sum is σ = 60616944. Its totient is φ = 50514100.

The previous prime is 55565509. The next prime is 55565533. The reversal of 55565521 is 12556555.

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 an interprime number because it is at equal distance from previous prime (55565509) and next prime (55565533).

It is a cyclic number.

It is not a de Polignac number, because 55565521 - 2²¹ = 53468369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55565501) 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, 2525695 + ... + 2525716.

It is an arithmetic number, because the mean of its divisors is an integer number (15154236).

Almost surely, 2^55565521 is an apocalyptic number.

It is an amenable number.

55565521 is a deficient number, since it is larger than the sum of its proper divisors (5051423).

55565521 is a wasteful number, since it uses less digits than its factorization.

55565521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5051422.

The product of its digits is 37500, while the sum is 34.

The square root of 55565521 is about 7454.2283973594. The cubic root of 55565521 is about 381.5942279928.

The spelling of 55565521 in words is "fifty-five million, five hundred sixty-five thousand, five hundred twenty-one".