55518561 has 16 divisors (see below), whose sum is σ = 94000000. Its totient is φ = 31724784.

The previous prime is 55518559. The next prime is 55518563. The reversal of 55518561 is 16581555.

55518561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55518559) and next prime (55518563).

It is not a de Polignac number, because 55518561 - 2¹ = 55518559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55518563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146686 + ... + 147063.

It is an arithmetic number, because the mean of its divisors is an integer number (5875000).

Almost surely, 2^55518561 is an apocalyptic number.

It is an amenable number.

55518561 is a deficient number, since it is larger than the sum of its proper divisors (38481439).

55518561 is a wasteful number, since it uses less digits than its factorization.

55518561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293765 (or 293759 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The square root of 55518561 is about 7451.0778414938. The cubic root of 55518561 is about 381.4866989884.

The spelling of 55518561 in words is "fifty-five million, five hundred eighteen thousand, five hundred sixty-one".