55568581 has 4 divisors (see below), whose sum is σ = 55879200. Its totient is φ = 55257964.

The previous prime is 55568543. The next prime is 55568587. The reversal of 55568581 is 18586555.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55568581 is a prime.

It is a super-2 number, since 2×55568581² = 6175734388707122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55568587) 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, 155041 + ... + 155398.

It is an arithmetic number, because the mean of its divisors is an integer number (13969800).

Almost surely, 2^55568581 is an apocalyptic number.

It is an amenable number.

55568581 is a deficient number, since it is larger than the sum of its proper divisors (310619).

55568581 is a wasteful number, since it uses less digits than its factorization.

55568581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310618.

The product of its digits is 240000, while the sum is 43.

The square root of 55568581 is about 7454.4336471660. The cubic root of 55568581 is about 381.6012326777.

The spelling of 55568581 in words is "fifty-five million, five hundred sixty-eight thousand, five hundred eighty-one".