55564581 has 16 divisors (see below), whose sum is σ = 75046400. Its totient is φ = 36566640.

The previous prime is 55564577. The next prime is 55564589. The reversal of 55564581 is 18546555.

It is not a de Polignac number, because 55564581 - 2² = 55564577 is a prime.

It is a super-2 number, since 2×55564581² = 6174845323411122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55564589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97026 + ... + 97596.

It is an arithmetic number, because the mean of its divisors is an integer number (4690400).

Almost surely, 2^55564581 is an apocalyptic number.

It is an amenable number.

55564581 is a deficient number, since it is larger than the sum of its proper divisors (19481819).

55564581 is a wasteful number, since it uses less digits than its factorization.

55564581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936.

The product of its digits is 120000, while the sum is 39.

The square root of 55564581 is about 7454.1653456306. The cubic root of 55564581 is about 381.5920761752.

The spelling of 55564581 in words is "fifty-five million, five hundred sixty-four thousand, five hundred eighty-one".