55218785 has 8 divisors (see below), whose sum is σ = 66346560. Its totient is φ = 44119024.

The previous prime is 55218767. The next prime is 55218797. The reversal of 55218785 is 58781255.

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 55218785 - 2⁸ = 55218529 is a prime.

It is a super-2 number, since 2×55218785² = 6098228433752450, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2387 + ... + 10776.

It is an arithmetic number, because the mean of its divisors is an integer number (8293320).

Almost surely, 2^55218785 is an apocalyptic number.

It is an amenable number.

55218785 is a deficient number, since it is larger than the sum of its proper divisors (11127775).

55218785 is a wasteful number, since it uses less digits than its factorization.

55218785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14007.

The product of its digits is 112000, while the sum is 41.

The square root of 55218785 is about 7430.9343288714. The cubic root of 55218785 is about 380.7988388886.

The spelling of 55218785 in words is "fifty-five million, two hundred eighteen thousand, seven hundred eighty-five".