55218755 has 8 divisors (see below), whose sum is σ = 68547600. Its totient is φ = 42651616.

The previous prime is 55218707. The next prime is 55218767. The reversal of 55218755 is 55781255.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55218755 is a prime.

It is a super-2 number, since 2×55218755² = 6098221807500050, which contains 22 as substring.

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, 190265 + ... + 190554.

It is an arithmetic number, because the mean of its divisors is an integer number (8568450).

Almost surely, 2^55218755 is an apocalyptic number.

55218755 is a deficient number, since it is larger than the sum of its proper divisors (13328845).

55218755 is a wasteful number, since it uses less digits than its factorization.

55218755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380853.

The product of its digits is 70000, while the sum is 38.

The square root of 55218755 is about 7430.9323102825. The cubic root of 55218755 is about 380.7987699268.

Subtracting 55218755 from its reverse (55781255), we obtain a square (562500 = 750²).

The spelling of 55218755 in words is "fifty-five million, two hundred eighteen thousand, seven hundred fifty-five".