55551218 has 8 divisors (see below), whose sum is σ = 83792880. Its totient is φ = 27620260.

The previous prime is 55551191. The next prime is 55551229. The reversal of 55551218 is 81215555.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77228 + ... + 77943.

It is an arithmetic number, because the mean of its divisors is an integer number (10474110).

Almost surely, 2^55551218 is an apocalyptic number.

55551218 is a deficient number, since it is larger than the sum of its proper divisors (28241662).

55551218 is a wasteful number, since it uses less digits than its factorization.

55551218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155352.

The product of its digits is 10000, while the sum is 32.

The square root of 55551218 is about 7453.2689472472. The cubic root of 55551218 is about 381.5614834027.

The spelling of 55551218 in words is "fifty-five million, five hundred fifty-one thousand, two hundred eighteen".