55116561 has 8 divisors (see below), whose sum is σ = 74734560. Its totient is φ = 36121472.

The previous prime is 55116553. The next prime is 55116563. The reversal of 55116561 is 16561155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55116561 - 2³ = 55116553 is a prime.

It is a super-3 number, since 3×55116561³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (55116563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155520 + ... + 155873.

It is an arithmetic number, because the mean of its divisors is an integer number (9341820).

Almost surely, 2^55116561 is an apocalyptic number.

It is an amenable number.

55116561 is a deficient number, since it is larger than the sum of its proper divisors (19617999).

55116561 is a wasteful number, since it uses less digits than its factorization.

55116561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311455.

The product of its digits is 4500, while the sum is 30.

The square root of 55116561 is about 7424.0528688850. The cubic root of 55116561 is about 380.5637086012.

The spelling of 55116561 in words is "fifty-five million, one hundred sixteen thousand, five hundred sixty-one".