55473561 has 24 divisors (see below), whose sum is σ = 94139136. Its totient is φ = 31033440.

The previous prime is 55473557. The next prime is 55473577. The reversal of 55473561 is 16537455.

55473561 is a `hidden beast` number, since 55 + 47 + 3 + 561 = 666.

It is not a de Polignac number, because 55473561 - 2² = 55473557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55473541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20265 + ... + 22838.

It is an arithmetic number, because the mean of its divisors is an integer number (3922464).

Almost surely, 2^55473561 is an apocalyptic number.

It is an amenable number.

55473561 is a deficient number, since it is larger than the sum of its proper divisors (38665575).

55473561 is a wasteful number, since it uses less digits than its factorization.

55473561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43133 (or 43130 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

The square root of 55473561 is about 7448.0575320012. The cubic root of 55473561 is about 381.3836010851.

The spelling of 55473561 in words is "fifty-five million, four hundred seventy-three thousand, five hundred sixty-one".